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Luda [366]
3 years ago
11

What is the theory of punctuated equilibrium

Biology
1 answer:
seropon [69]3 years ago
5 0
Which proposes that once species<span> appear in the </span>fossil record<span> they will become stable.... i think i just wanted to help......</span>
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kodGreya [7K]
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The region of a Drosophila embryo with a low concentration of bicoid protein will develop into the _____. a) abdomenb) male flow
joja [24]

Answer:

The correct option is d) head.

Explanation:

Bicoid protein works as a transcription factor. It enters the nuclei of the embryos in early segmentation, where it activates the hunchback gene. In Drosophila, embryonic development begins at the time of fertilization. The sperm enters the mature oocyte through the micropile, a structure located in what will be the anterior region of the egg. Bicoid and hunchback mRNAs, protein products are critical for the formation of the head and thorax. Already in the early stages of oocyte development, certain mRNAs are located in specific regions of the oocyte: mRNA molecules encoding the Bicoid protein are preferentially located in the anterior region of the oocyte. Moderate levels of the bicoid protein are necessary to activate the formation of the thorax (i.e., the expression of the hunchback gene) but the formation of the head requires high concentrations of Bicoid, the promoters of a specific gap gene of the head must have sites of low affinity binding for Bicoid, so that this gene can be activated only in extremely high concentrations of Bicoid.

The lack of Bicoid protein affects the formation of the head and other structures in the anterior region of the oocyte.

6 0
3 years ago
Which two sentences use coordinate adjectives?
gogolik [260]

The two sentences which use coordinate adjectives include:

  • The dark, musty cellar was full of mice.
  • The dark-haired, hazel-eyed baby was gurgling happily.

<h3>What are Coordinate adjectives?</h3>

These are words which describe the features of the same noun and is usually separated by a comma.

Options A and C have coordinate adjectives such as 'dark' and the 'dark-haired' respectively.

Read more about Coordinate adjectives here brainly.com/question/14242023

#SPJ1

8 0
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How did scientist prove that dolly was not a result of a sneak mating
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DNA checking

2.after few days it's growth rate was so great

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