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Andrew [12]
2 years ago
12

Some organisms, like lizards who bask in the sun, use ____________ to help regulate their ____________ environment.

Biology
1 answer:
dolphi86 [110]2 years ago
7 0

Answer:

location, internal

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In drosophila the anterior-posterior axis is established bya. The distribution of the RNA-binding transcription factor called bi
vova2212 [387]

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 BICOID genes place in the <u>anterior part of the egg</u> and activate the hunchback genes that determine the development of the head and the thorax. The Bicoid mRNA distributes in the anterior region of the egg.
  • The NANOS gene reprimes the hunchback genes, which promoted the development of the posterior structures of the body. <u>The Nano mRNA places in the posterior region of the egg, and Nano proteins distribute in this area.</u>

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.

7 0
3 years ago
There is a theory that gravity could pull galaxies back together, causing a reverse big bang.
Rashid [163]

Answer: The expansion of the universe is accelerating.

Explanation: Every millisecond the expansion slowly but surely speeds up.

8 0
3 years ago
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What causes stunted growth in trees in cities? Lack of water lack of sun nuitrients smog
Yuliya22 [10]
I'd say the answer to this queston is smog

5 0
3 years ago
Some reflexes, like the rooting, sucking and grasping reflex, are theorized to exist because
AveGali [126]

Some reflexes are theorized to exist because they have the survival value. Sigmund Freud First to theorize that we pass through different stages, behaviour is governed by the reflexes that we are born with, start to develop schemata, but need to develop permanence.

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3 years ago
In which process are the homologous chromosomes separated?<br><br> A. Meiosis<br><br> B. Mitosis
vovangra [49]

Answer:

A. Meiosis

Explanation:

Since Meiosis is the process of separating homologous chromosomes way from each other while Mitosis don't the answer will be A. Meiosis

Hope this helps!

6 0
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