In drosophila the anterior-posterior axis is established bya. The distribution of the RNA-binding transcription factor called bicoid and the protein nanos localized in the anterior and posterior poles of the embryo, respectivelyb. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the anterior pole of the embryo and a transcription factor called bicoid localized in the posterior pole of the embryo

Complete question:

In Drosophila the anterior-posterior axis is established by

a. The distribution of the RNA-binding transcription factor called bicoid and the protein nanos localized in the anterior and posterior poles of the embryo, respectively

b. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the anterior pole of the embryo and a transcription factor called bicoid localized in the posterior pole of the embryo

c. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the posterior pole of the embryo and a transcription factor called bicoid localized in the anteror pole of the embryo

d. The distribution of the RNA-binding transcription factor called bicoid and the protein nanos localized in the posterior and anterior poles of the embryo, respectively

Answer:

c. The distribution of a gene that codes for an RNA-binding protein called nanos localized in the posterior pole of the embryo and a transcription factor called bicoid localized in the anterior pole of the embryo

Explanation:

When the Drosophila zygote develops, it goes through different stages until it gets to the blastula stage. At this point, there are pole cells that determine the axis of the organism -the anteroposterior and the dorsoventral axis-.

A two hours old embryo has already determined its two axes. A ten hours old embryo has already determined its body segments. And from there, each of them develops a structure that turns to be their identity.

Different genes determine the polarity of the egg.

Dorsoventral genes place in the superior and inferior parts of the egg and determine the development of dorsal and ventral tissues.

The same happens with anteroposterior genes.

The polarity genes of the egg are genes of maternal effects.

While the bicoid and nano genes are expressed in the ovary, the hunchback gene is expressed in the embryo. This last one is activated or inhibited by the foreign ones.

Bicoid and nano genes gradient regulate the expression of the gap, pair-rule, and segment polarity genes.

Use the information and model to answer the following question.

can somebody please help me? :)

Which of the following is NOT a rapid (fast) change in Earth's surface? *

1 point

landslides

volcanoes

deltas

earthquakes
HELPPPPP PLZ NEED IT BY TODAY PLLZZZZZZ 10 PIONTS

Which part of a molecule provides energy for life processes? *
(1) carbon atoms
O (2) oxygen atoms
(3) chemical bonds
(4) inorganic nitrogen

When the cells start multiplying at an abnormal rate it leads to complications in our body.What could be the reason for this?Find Out

(06.04 LC)

Fertilization usually occurs in the (3 points)

A. End of the Fallopian tubes B. Vagina
C. Ovaries
D. Uterus

The sequence of mRNA is AGUACA. Which of these is the sequence of
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UCAUGU
AGTACA
AGUACA
TCATGT

What are two things you would do to protect wetlands?

A controlled experiment was conducted to analyze the effects of darkness and boiling on the photosynthetic rate of incubated chloroplast suspensions. The dye reduction technique was used. Each chloroplast suspension was mixed with DPIP, an electron acceptor that changes from blue to clear when it is reduced. Each sample was placed individually in a spectrophotometer and the percent transmittance was recorded. The three samples used were prepared as follows.
Sample 1 – chloroplast suspension + DPIP
Sample 2 – chloroplast suspension surrounded by foil wrap to provide a dark environment + DPIP
Sample 3 – chloroplast suspension that has been boiled + DPIP
On the axes provided, construct and label a graph showing the results for the three samples.

4
Select all the correct answers.
Which three human activities lead to a loss of terrestrial habitat?
conservation
farming
deforestation
construction
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A. higher density
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A.True
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O True
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stores DNA
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packages proteins

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Normal red blood cells slide easily through narrow blood vessels. In sickle cell disease, many red blood cells change to a crescent shape like a slender moon. Crescent-shaped blood cells cause blockages in blood vessels. These blockages decrease the transport of oxygen. People with sickle cell disease often have sharp pains due to the lack of oxygen in parts of the body.

(Will mark Brainliest when someone answers)


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Which of the following sources of noise pollution has the greatest likelihood of leading to hearing loss
for exposed individuals in an urban area?
Your answer:
car horns
conversation
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O traffic on a residential street

Please help i am giving brainliest


What is homeostasis?


A. the ability of an organism to maintain a relatively stable internal environment.


B. the production of a hormone by an endocrine gland that works on another endocrine gland



C. a series of events that monitor how hormones work in the body


D. a process in which a change in the environment causes a response that returns conditions


to their original status


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Determine the conditions when a long tail would be an adaptation

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A student is studying the levels of organization in living things and creates a table to give examples of the different levels.



Which of these should the student write as an example of the organism level of organization?


human

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1. Which of the following most accurately complete the statement below -
An increase in biodiversity result in
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B. Less competition for biotic factors
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D. A decrease in the sustainability of an ecosystem

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Consider the following alleles: X1, X2, X3. The different alleles encode enzymes with slightly different ratesof reaction, but are otherwise identical. Consider a population that is sampled for these alleles at two different times. Below are the genotypes for each individual in this population at time 1. For the Time 1 population calculate the allele frequencies and genotype frequencies.(4points)