1.If the even-skipped gene is non-functioning, which of the following types of g
ID: 72272 • Letter: 1
Question
1.If the even-skipped gene is non-functioning, which of the following types of genes would you predict to be mis-expressed?
gap, segment-polarity, and homeotic genes
segment-polarity genes
gap genes
homeotic genes
segment-polarity and homeotic genes
2.
The SRY gene on the Y chromosome.
The AR gene on the X chromosome.
The Srd5A2 gene on chromosome 2.
The Cyp21 gene on chromosome 6.
Not enough information to know which gene is mutated.
3.
black and red
black
red
black and blue
blue and red
a.gap, segment-polarity, and homeotic genes
b.segment-polarity genes
c.gap genes
d.homeotic genes
e.segment-polarity and homeotic genes
Explanation / Answer
1.
The correct answer is option (e) both segment-polarity genes and homeotic genes. These two genes are under the control of even-skipped gene, whereas gap genes are expressed very early during embryogenesis, prior to the expression of even-skipped genes.
2.
MOST likely the SRY gene on the Y chromosome has a genetic mutation. This gene provides instructions for making a protein called the sex-determining region Y protein. It plays an important role in male sexual development. Any mutation in that gene would result in poor male characteristics and develop female characteristics. Hence, the correct answer is option (a) The SRY gene on the Y chromosome.
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