A number of genes that control expression of Hox genes i...

Question

A number of genes that control expression of Hox genes in Drosophila have been identified. One of these homozygous mutants is extra sex combs, where some of the head and all of the thorax and abdominal segments develop as the last abdominal segment. In other words, all affected segments develop as posterior segments. What does this phenotype tell you about which set of Hox genes is controlled by the extra sex combs gene?

Accepted Answer

Hey, everyone. Let's take a look at this question together in Drosophila, Milano Gaster. The extra sex combs gene controls the development of sex combs and males. What happens when the extra sex combs gene is mutated in male Drosophila flies? Well, let's recall what we know about the importance of the extra sex combs gene. And what would happen if that gene is mutated in the male Drosophila flies. So we know that the extra sex comb gene is responsible for regulating the development of the sex combs in the male Drosophila flies. And when we have this mutated, that means that we have that reduction of development of sex combs, which means that we end up with either improper function or even an absence of the sex homes in the male Drosophila fly us, meaning that the number of the sex combs decreases. So, answer choice B is the correct answer because in the Drosophila flies, the extra sex combs gene controls the development of sex combs and males. And when we have this mutated extra sex comb gene, that means that we have a reduction of the development of the sex combs and we end up with an improper function or absence of sex combs entirely. So the number of sex combs decreases. So answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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