Answer: A Physical Barrier. ...
Selective Permeability. ...
Endocytosis and Exocytosis. ...
Cell Signaling. ...
Phospholipids. ...
Proteins. ...
Carbohydrates. ...
Fluid Mosaic Model.
Explanation: Have a good rest of the day.
Compare/contrast the motor impulse going to a somatic muscle and the motor impulse going to a visceral organ and give the differences between the two pathways. Use a chart similar to the one below to record your points about each. Feel free to reduce or add addition blocks if needed. A. Motor impulses to a somatic muscle originate in the anterior gray horn, goes to voluntary muscles and involves only the preganglionic fiber, whereas the motor impulse to visceral organs originate in the lateral gray hor, goes to glands and organs, and can involve only the preganglionic fiber or both the pre- and post- ganglionic fibers. B. Motor impulses to a somatic muscle originate in the lateral gray horn, goes to involuntary muscles and involves the pre- and post-ganglionic fibers, whereas the motor impulse to visceral organs originate in the anterior gray horn, goes to voluntary muscles, and involves only the preganglionic fiber. C. Motor impulses to a somatic muscle originate in the anterior gray hom, goes to voluntary muscles and involves only the preganglionic fiber, whereas the motor impulse to visceral organs originate in the lateral gray hom, goes to glands and organs, and can involve only the pre- and post- ganglionic fibers. 17. Would a low calcium diet influence the contraction of a muscle? A. No because sodium is the ion that takes the message into the cell. Calcium is only important for going into the neuron to cause the release of AcH. B. No because sodium is the ion that takes the message into the cell. Calcium is not use in the process of muscle contraction C. Yes because calcium is needed to uncover the active site on actin so that the cross bridges can form and start the sliding process.
Motor impulses to a somatic muscle originate in the anterior gray horn, goes to voluntary muscles and involves only the preganglionic fiber, whereas the motor impulse to visceral organs originate in the lateral gray hor, goes to glands and organs, and can involve only the preganglionic fiber or both the pre- and post- ganglionic fibers.
The motor system is the set of central and peripheral structures in the nervous system that support motor functions, i.e. movement. Peripheral structures may include skeletal muscles and neural connections with muscle tissues. Central structures include cerebral cortex, brainstem, spinal cord, pyramidal system including the upper motor neurons, extrapyramidal system, cerebellum, and the lower motor neurons in the brainstem and the spinal cord.
Motor impulses to a somatic muscle originate in the anterior gray horn, goes to voluntary muscles and involves only the preganglionic fiber, whereas the motor impulse to visceral organs originate in the lateral gray hor, goes to glands and organs, and can involve only the preganglionic fiber or both the pre- and post- ganglionic fibers. The motor system is the set of central and peripheral structures in the nervous system that support motor functions, i.e. movement.
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a bone has high concentration of calcium yet wants to absorb even more calcium in order to become more dense stronger. the movement of more calcium requires energy and would be done by
Answer:
a process called active transport. this process requires calcium channels to open and close in order to allow calcium ions to move into the bone. this process is powered by adenosine triphosphate (ATP) which is a molecule that stores energy.
What is the power house of cell?
Answer:
Mitochondria
Explanation:
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
A farmer grows rice plant. For which water should be stagnant which soil
is suitable for it? Why?
Answer:
if more is poured there is chance of dieying plants
The type of soil which should be suitable for the ideal growth of rice plants is soil with good water retention capacity and a high amount of clay and organic matter ideal for rice cultivation.
Which type of soil is best for rice cultivation?Rice will grow best in semi-acidic soil that has very little drainage. Heavy clay or loam will retain water well, and you can use mulch, compost, or fertilizer-rich potting soil to create the right environment for growth. This is known as Loamy soil.
Water significantly creates some sorts of unfavorable conditions for weeds, by cutting off sunlight and aeration to the ground. So, rice farmers adopted the practice of submerging rice in water to check weeds. Over the years, it has almost become a prerequisite for rice cultivation.
Therefore, loamy soil is a type of soil that should be suitable for the ideal growth of rice plants.
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Lab Topic: Relative and Absolute Dating
Section I: Overview of Lab
1. What is the purpose of the lab?
Answer:
I: Relative dating techniques determine if an object is more recent or more antiquated than other items discovered nearby. Absolute dating techniques offer more precise origin dates and historical periods, including a range in age expressed in years.
1.Relative dating does not provide precise dates; rather, it merely shows which item, fossil, or stratigraphic stratum is older. Absolute dating techniques offer more precise origin dates and historical periods, including a range in age expressed in years.
Explanation:
What is the difference between the two?
A rock layer's relative age is how old it is in relation to other layers of rock (or the fossils it contains). By observing the location of the rock strata, it can be discovered. The numerical age of a layer of rocks or fossils is its absolute age.
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Absolute dating and relative dating are the two types of dating techniques employed by archaeologists.
It is beneficial to present a tale that has all the major events occurring in the correct order. To understand the order is referred to as stratigraphy (layers of rock are called strata). The exact numerical ages of the rocks cannot be determined using relative dating. This link may be used by archaeologists to conclude that artefacts found deep down are older than those found close to the surface. Absolute dating is a technique used by archaeologists to pinpoint an object's exact age. Using measurements of an object's physical features, absolute dating procedures use the information to calculate the object's age.
The goal of the lab is to teach participants how to learn by examining reality rather than by attempting to manipulate reality to fit preconceived notions. Learning to be alert, paying attention to what happens, and handling this knowledge with the utmost honesty are crucial.
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In the readings, a claim is made that ice cooling is a good way to cool large buildings. Create an argument to support this claim. Give reasons and evidence from the texts. Also tell what you may already know about air conditioning and temperature control.
An argument to support the claim that ice cooling is a good way to cool large buildings is that it is a more efficient and cost-effective method than traditional air conditioning. Ice cooling works by storing energy in the form of ice during off-peak hours, and then using the stored energy to cool the building during peak hours. This reduces the amount of energy needed to cool the building, resulting in lower energy costs. Additionally, ice cooling systems are more efficient than traditional air conditioning systems, as they are able to maintain a more consistent temperature throughout the building.
I also know that traditional air conditioning systems are not as efficient as ice cooling systems, as they require more energy to cool the building. Additionally, traditional air conditioning systems are not as effective at maintaining a consistent temperature throughout the building, as they are more prone to fluctuations in temperature. This can lead to uncomfortable temperatures in certain areas of the building.
A researcher designs an experiment to investigate whether soil bacteria trigger the synthesis of defense enzymes in plant roots. The design of the experiment is presented in Table 1. For each group in the experiment the researcher will determine the average rate of change in the amount of defense enzymes in the roots of the seedlings Table 1. An experiment to investigate the effect of soll bacteria on plant defenses Group Number of Seedings Type of Soil Treatment Solution 1 10 Sterlepotting sol Contains actively reproducing soll bacteria 2 10 Sterile potting sol Contains heille soll bacteria 3 10 Sterle porting soil Contains no bacteria Which of the following statements best helps justify the inclusion of group 2 as one of the controls in the experiment? A) I will show whether the changes observed in group 1 depend on the metabolic activity of Boll bacteria B) will show whether the changes observed in group 1 depend on the type of plants used in the experiment. C) It will show the average growth rate of seedings that are maintained in a nonsterile environment D) I will show the changes that occur in the roots of seedlings following an infection by soll bacteria.
Among the given statements (A) "I will show whether the changes observed in group 1 depend on the metabolic activity of Boll bacteria" best helps justify the inclusion of group 2 as one of the controls in the experiment.
In this instance, soil bacteria that were destroyed by heat are being employed to ascertain if the creation of enzymes by the plant is aided by the bacteria's metabolic products or just their physical form. Because the outcomes of these types of tests occasionally depend on the metabolic interactions between the pathogen (bacteria) and the host, this is a very helpful control (the plant). So, (A) is the right option.
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How is energy causing motion or creating a change in water
Answer:
basically work requires energy so we can say energy is directly proportional to work SO FORMULA OF WORK IS = Force × distance so energy = work
Explanation:
sorry if that doesnt make sense
an ordered sequence of events (including interphase and the mitotic phase) that extends from the time a eukaryotic cell is first formed from a dividing parent cell until its own division into two cells.
Cell cycle is an ordered sequence of events (including interphase and the mitotic phase) that extends from the time a eukaryotic cell is first formed from a dividing parent cell until its own division into two cells.
A cell cycle is the sequence of events that occur in a cell as it develops and divides. A cell spends the majority of its time in what is known as interphase, where it expands, reproduces its chromosomes, and arranges for cell division. The cell then exits interphase, goes through mitosis, and divides completely.
The cell cycle could be considered as a cell's life cycle. In other words, it is the sequence of growth and development steps that a cell goes through between "birth"—formation by the division of a mother cell—and reproduction—division to produce two new daughter cells.
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the red line shows the growth predicted by the logistic model, and the black dots show the measured growth of the population. does the measured growth match the predicted growth pattern? mastering
No, the measured growth does not match the predicted growth pattern by the logistic model It is lower than the predicted values in some parts and higher in other parts.
In population logistic models, logistic growth contributes to the gradual increase of population at first and then increases as the population grows.
The per capita growth rate of a population decreases as size of the population reaches an optimum imposition by restricted resources available in the environment, identified as the carrying capacity ( K). A J-shaped curve is produced by exponential growth, whereas an S-shaped curve is produced by logistic growth model.
Because of the effect of carrying capacity, the logistic growth model is more precise than other models in predicting population growth. The concept of carrying capacity refers to the idea that assets are always confined since the environment can only sustain a certain amount of people in a population.
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Genotype 'AS' is favored over genotypes SS and AA. Given the following observed/ expected numbers, calculate the relative fitness of the 'SS genotype. 'SS' Obs = 4, Exp = 17, 'AS' Obs=166, Exp =127 'AA' Obs = 1030, Exp = 1056 I I
Genotype 'AS' is favored over genotypes SS and AA because it is more fit. Fitness is a measure of how well a genotype can survive and reproduce in the environment it inhabits.
The relative fitness of a genotype is the ratio of its observed to expected numbers. In this example, the observed and expected numbers for genotype 'SS' are 4 and 17 respectively. Therefore, the relative fitness of 'SS' is 4/17 = 0.235.
This means that the genotype 'AS' is more fit than genotype 'SS' because its relative fitness (166/127 = 1.309) is higher. The relative fitness of genotype 'AA' is 1030/1056 = 0.977, which is lower than that of genotype 'AS'. This indicates that genotype 'AS' is more fit than both genotypes 'SS' and 'AA'.
Overall, the genotype 'AS' is favored over genotypes 'SS' and 'AA' because it is more fit. This is evidenced by the relative fitness of each genotype, which shows that genotype 'AS' has a higher fitness than both 'SS' and 'AA'.
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Your friend Rashid wants to start a new business and has requested you to help him out in pricing his product. His invested capital is $7000, and he anticipates that the average cost of producing 500 units of his product is $100. He wants at least a 10% return on invested capital. On hearing this, you immediately ask him to use the targeted rate of return method for pricing. Based on this method, what price would ask him to set for his product?
The price that Rashid should set for his product is $104.
What price would be set for his product?In this case, Rashid wants to start a new business and has requested you to help him out in pricing his product. His invested capital is $7000, and he anticipates that the average cost of producing 500 units of his product is $100.
By taking the invested capital, dividing it by the quantity of units produced, and multiplying it by the target rate of return (in this case, 10%), the targeted rate of return method determines the price of a product.
7000 / 500 = 14
14 x 10% = 1.4
14 + 1.4 = 15.4
15.4 / 500 = 0.0308
0.0308 x 500 = 104
The price will be $104.
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WILL MARK BRAINLYIST
1 = Decomposition
2 = Combustion
3 = Double-replacement
4 = Synthesis
5 = Single-replacement
I tried my best, I hope it's right!
According to MacArthur and Wilson's hypothesis of island biogeography, species immigration and extinction rates on a particular island correlate to _____.
According to MacArthur and Wilson's hypothesis of island biogeography, species immigration and extinction rates on a particular island correlate to the island's size and distance from the mainland.
In 1967, MacArthur and Wilson proposed the Theory of Island Biogeography, which suggested that the size of the island and its distance from the mainland determine the number of species and their extinction rates.
The following are their recommendations:
1. There are fewer species on the islands that are further from the mainland than on the mainland that is closest.
2. When compared to the larger island, the smaller island has a higher rate of species extinction.
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which of the following ventricles is found under the corpus callosum? view available hint(s)for part a which of the following ventricles is found under the corpus callosum? fornix lateral ventricles third ventricle fourth ventricle
Lateral ventricles are divided by the septum pellucidum within the cerebrum are cavities known as the lateral ventricles.
What is the function of septum pellucidum?The septum pellucidum divides the right and left lateral ventricles midway. The cerebrospinal fluid (CSF), which cushions the brain, fills the spaces that make up the ventricular system of the brain.Each cerebral hemisphere contains a C-shaped hollow known as the lateral ventricle.
Ependyma lines the inside, which is filled with CSF. It has a 7 to 10 ml capacity. The septum pellucidum, a thin vertical sheet of nervous tissue that divides the two lateral ventricles, is surrounded by ependyma on both sides.
Therefore, Lateral ventricles are divided by the septum pellucidum within the cerebrum are cavities known as the lateral ventricles.
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Describe the path of an oocyte from ovary to fertilization please!
An oocyte is also known as egg cell which is a female gamete, it is produced by the ovaries and travels through the female reproductive tract and fuse with the sperm to form zygote.
What is fertilization?Fertilization can be defined as the fusion of a haploid male gamete i.e., spermatozoa or sperm and a haploid female gamete i.e., ovum to form a diploid cell (2n), the zygote inside the body of the female in case of mammals. The fertilization is internal in the case of humans and usually after nine months the fully matured baby is born.
The path of the haploid (n) oocyte or egg cell from the ovary to fertilization include first, the oocyte leaves the ovary as an unfertilized egg during the period of ovulation. From here, the oocyte enters uterine tube (fallopian tube) and begins to move down towards the uterus, through the help of cilia which are present along the walls of the fallopian tube. If fertilization is taking place, it usually happens within the next 24 hours or else the oocyte degenerate.
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The evidence related to the Big Bang theory best supports which one of the following ideas?
The universe is cooling to the point where it will start to contract.
The elements formed by the Big Bang exist in the smaller ratios today.
The universe is warming very rapidly.
Radiation from the Big Bang is distributed evenly in the universe.
The evidence that related to the Big bang theory best supports the universe is warming very rapidly and the radiations from the Big bang is distributed evenly in the universe. Thus, the correct options are 3 and 4.
What is the Big bang theory?
The Big Bang theory is an explanation that supports the early development of the Universe. According to the big bang theory, the Universe expanded from an extremely small, extremely hot, and dense state that does not support life. Since the universe has expanded and become less dense and cooler and gradually the conditions on the planet become favorable.
Some of the key observations that supports the big bang theory include expansion of the universe, cosmic microwave radiations, and the abundance of the lightest chemical elements.
Therefore, the correct options are 3 and 4.
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2. Describe a specific marine relationship among marine organisms. Predict what
would happen in the marine ecosystem if this relationship no longer existed.
Marine ecosystems are aquatic environments with high levels of dissolved salt, such as those found in or near the ocean.
What are most marine organisms?
Plankton are the most common. Plankton make up one of three major groups of marine life. The other two groups are nekton and benthos (Figure below). Living things in the oceans are placed in these three groups.
What are marine organisms called?
The animals inhabiting the sea are called marine organisms. Marine organisms may be classified as Nektonic, Planktonic, or Benthic. The distribution of marine organisms depends on the chemical and physical properties of seawater, ocean currents & penetration of light.
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describe the arbor vitae, including its makeup, location, and function. (module 13.6b) describe the arbor vitae, including its makeup, location, and function. (module 13.6b) the arbor vitae is gray matter of the cerebellum that interconnects pontine nuclei with the opposite cerebellar hemisphere. the arbor vitae is white matter of the cerebellum that carries communications between the cerebellum and pons. the arbor vitae is white matter of the cerebellum that connects the cerebellar cortex and nuclei with cerebellar peduncles. the arbor vitae is white matter of the cerebellum that links the cerebellum with the medulla oblongata and spinal cord. the arbor vitae is white matter of the cerebellum that connects the cerebellum with the midbrain, diencephalon, and cerebrum.
The arbor vitae is the white matter of the cerebellum that connects the cerebellar cortex and nuclei with cerebellar peduncles.
The arbor vitae is primarily made up of myelinated axons, which aid in the transmission of nerve impulses throughout the body. Myelinated axons are white with a faint pink tint. The pinkish hue is caused by the myelin sheath, which surrounds and safeguards the axons.
Arbor vitae is the greatest white matter found in the cerebellum's center. It gets its name from its branched, tree-like presentation. It is essential for arm and leg coordination, as well as any action requiring hand-eye coordination.
The arbor vitae is deep within the cerebellum. The deep cerebellar nuclei, as well as the dentate, globose, emboliform, and fastigial nuclei, are located within the arbor vitae. These four distinct structures give rise to the cerebellum's efferent projections.
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6. A high school student conducted an experiment. The student grew two organisms alone in a petri
dish. In graph "a" species 1 is shown growing alone, and in graph "b" species 2 is shown growing alone.
The student then grew the two organisms together in a new dish. Graph "c" shows the numbers of
Species 1 and 2 over time.
Explain what is happening in graph "c." Justify your answer with a scientific term & evidence from the
graphs.
In graph C, species 1 and species 2 are both in competition for resources.
What is competition in living organisms?Competition in living organisms is the process by which two or more living organisms compete for a limited resource such as food, water, space, and mates.
Two organisms are involved in a competition when they occupy the same trophic level in a food chain.
The experiment by the student shows two orgasms that use the same nutrient.
Species 1 and Species 2 both require the same nutrients for growth, hence, they compete for the same resources. When they are grown in the same medium, Species 1 grows more than species 2.
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PLEASE I NEED HELP! Fungi break down dead matter. A container of carbon dioxide has its carbon tagged. In a sealed container there are plants, animals, and fungi. In what order would the tagged carbon be found?
Visit the link below and use the information to
answer the following question.
Why Is Biodiversity Important? Who Cares?
Name three ecosystem services provided by
biodiversity.
Biodiversity provides ecosystem services such as regulation of ecosystem processes, provision of resources, and cultural and aesthetic value.
What is biodiversity?
Biodiversity, or the variety of species and ecosystems present in an area, is important for a number of reasons. Here are three ecosystem services provided by biodiversity:
Regulation of ecosystem processes: Biodiversity helps to regulate the processes that sustain life, such as the water cycle, nutrient cycling, and pest control. For example, a diverse array of predators helps to keep prey populations in check, while a variety of plants and microbes help to recycle nutrients and maintain soil health.
Provision of resources: Biodiversity provides us with a wide range of resources, including food, medicine, timber, and fuel. Many of the crops that we rely on for food, such as rice, wheat, and corn, are pollinated by bees and other insects, which are essential components of biodiversity.
Cultural and aesthetic value: Biodiversity is also important for cultural and aesthetic reasons. Many people derive enjoyment and inspiration from observing and interacting with the natural world, and the loss of biodiversity can diminish these experiences.
Given the numerous benefits that biodiversity provides, it is important to protect and conserve it. Biodiversity is vital for maintaining the health and functioning of ecosystems, which in turn supports the well-being of humans and other species.
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the image below shows types of cellular transport identified as passive transport. which statement below is true concerning passive transport?
In a natural flow, substances travel from high- to low-concentration locations.
Passive transport is what kind of transportation is it?Ions and molecules migrate along their respective concentration gradients during passive transport, a kind of cellular transport. The drug has a tendency to travel from a region of higher concentration to an area of lower concentration, according to this.
In reality, molecules migrate along their concentration gradient; passive transport just expedites this motion or permits molecules to traverse the membrane that would not otherwise be able to do so.
The lungs' alveoli, where oxygen is found, are where it diffuses into the blood's erythrocytes and plasma. Molecules travel from a high concentration to a low concentration through a process known as diffusion.
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An S wave is a type of seismic wave called a transverse wave . Transverse waves occur when the material that carries
the waves moves up and down or side to side. Aside from a seismic wave, what is an example of a transverse wave that
you have observed?
An example of a transverse wave that I have observed is a wave on the surface of a body of water, such as an ocean wave or a wave in a pool.
What is a transverse wave?A transverse wave is a type of wave that involves the movement of particles in a medium (such as a solid, liquid, or gas) perpendicular to the direction of the wave. In other words, the particles of the medium move up and down or side to side as the wave passes through. This is in contrast to a longitudinal wave, which involves the movement of particles along the direction of the wave.
Examples of transverse waves include waves on the surface of a body of water, light waves, radio waves, and microwaves. These types of waves are all characterized by the movement of the particles that carry the wave being perpendicular to the direction of the wave. Transverse waves are also described by their wavelength, which is the distance between two successive crests or troughs of the wave, and their frequency, which is the number of cycles of the wave per second.
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Answer: A guitar string or oscillating jump rope are examples of transverse waves.
Explanation: The real actual answer from Edmentum
Label the part of mitosis to the action that occurs during that phase.
15. I
16. G
17. C
18. A
19. H
20. F
21. J
22. B
23. D
24. E
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which of the following is not true of stem cells ?they can be used to synthesize proteins important in medicine they can divide indefinitely they are capable of turning into many different kinds of cells they may be able to repair damaged tissues
Oligopotent stem cells can differentiate into several cell types. A myeloid stem cell is an example that can divide into white blood cells.
Baby timothy suffers from apnea and is hooked up to a monitor to warn his parents when he stops breathing. timothy's dad snores very loudly. timothy's condition differs from his father's in that infant apnea is...
Baby timothy suffers from apnea and is hooked up to a monitor to warn his parents when he stops breathing. timothy's dad snores very loudly. timothy's condition differs from his father's in that infant apnea is a central problem of respiratory control.
Sleep apnea is a potentially dangerous sleep disorder in which respiration stops and starts repeatedly. You may have sleep apnea if you snore loudly and feel exhausted even after a full night's sleep.
Central sleep apnea takes place when your brain fails to send appropriate messages to the muscles that regulate your breathing during sleep. This is not the same as obstructive sleep apnea, in which you can't breathe usually due to upper airway obstruction. Obstructive sleep apnea is more common than central sleep apnea.
Snoring loudly and extreme tiredness even after a full night's sleep are symptoms. Losing weight and the usage of a breathing assistance device at night, such as a continuous positive airway pressure (CPAP) machine, are common treatments.
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Which of the following statements about erythropoietin
is true?
a. It facilitates the proliferation and differentiation of the erythrocyte lineage.
b. It is a hormone produced by the thyroid gland.
c. It is a hemopoietic growth factor that prompts lymphoid stem cells to leave the bone marrow.
d. Both a and b are true.
It facilitates the proliferation and differentiation of the erythrocyte lineage.
What is Erythrocyte lineage?
Erythrocyte lineage refers to the process of erythrocyte (red blood cell) production, maturation, and destruction. It begins with stem cells in the bone marrow, which differentiate into the cells that form the red blood cells. These cells then mature and are eventually released into the bloodstream, where they circulate for about 120 days before being destroyed.
What is Erythropoietin?
Erythropoietin (EPO) is a hormone produced by the kidneys that stimulates the production of red blood cells in the bone marrow. It is primarily used to treat anemia caused by chronic kidney disease, cancer, and HIV/AIDS, as well as to boost the performance of athletes.
Hence, Option A is correct.
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Which of the following substances are produced by the body cells to protect uninfected cells from viral invasion ?
a. histamineb. complementc. natural killer celld. interferons
Interferons are produced by the body cells to protect uninfected cells from viral invasion. So, the correct option is (D).
What are Interferons?Interferons (IFNs) are defined as a group of signaling proteins which are released by host cells in response to the presence of many viruses. A virus-infected cell releases interferons that cause nearby cells to mount their anti-viral defenses.
These are a group of proteins called cytokines which are produced by white blood cells, fibroblasts, or T-cells as part of the immune response to viral infection or other immune triggers. The proteins' name comes from their ability to interfere with the production of new virus particles.
These substances are produced by the body cells to protect uninfected cells from viral invasion.
Thus, Interferons are produced by the body cells to protect uninfected cells from viral invasion. So, the correct option is (D).
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You are a researcher on a behavior genetics study studying identical and fraternal twins; based on what has been discussed in lectures, you would propose that the environment was responsible for a given behavior when you find which of the following patterns of correlations?Select one:a. .70 for identical twins; .35 for fraternal twins.b. .35 for identical twins; .70 for fraternal twins.c. .35 for both identical and fraternal twinsd. one cannot determine environmental effects in a behavior genetics study, only genetic effects
Environment was responsible for a given behavior when you find 0.35 for both identical and fraternal twins patterns of correlations.
Fraternal twins account for two-thirds of all twins worldwide. Around the world, the rate is about 3 in 1,000. Only one-third of the world's twins are identical.
One fertilized egg (ovum) splits and evolves into two babies with identical genetic information to form identical or monozygotic twins. Two eggs (ova) are fertilized by two sperm to produce two genetically distinct children known as fraternal or dizygotic twins.
Same-sex fraternal twins can have strikingly similar appearances. Fraternal twins, like all siblings, are the result of two individually fertilized eggs from the same mother and father. They are genetically identical to non-twin siblings.
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