In contrast to Drosophila, some insects (e.g., centipedes) have l...

Question

In contrast to Drosophila, some insects (e.g., centipedes) have legs on almost every segment posterior to the head. Based on your knowledge of Drosophila, propose a genetic explanation for this phenotype, and describe the expected expression patterns of genes of the Antennapedia and bithorax complexes.

Accepted Answer

Hey, everyone. Let's take a look at this question together. In contrast to Drosophila, some insects have legs on almost every segment posterior to the head. This phenotype may be explained by which is it mutations in the genes of the anopia and by thorax complexes. Answer choice B changes in the segmentation pattern of the posterior region. Answer choice C disruption of genes involved in leg development or answer choice d alterations in the regulatory elements of the Hawks genes. Let's work this problem out together to try to figure out which of the following answer choices, explains the phenotype of some insects having legs on almost every segment. So since we're talking about the segment posterior to the head, we know that the genes responsible or the regulation of the development of body segments, which includes the area anterior and posterior to the head are the genes. And the Hawks genes work to regulate the expression of the genes responsible or segmental patterning and leg development, which means that changes in the expression of these jeans can result in altered expression patterns. And since the genes that can have those altered expression patterns are the genes that are responsible for the segmental patterning. And the leg development can lead to those insects having legs on almost every segment posterior to the head. So this phenotype can be explained by those alterations in the regulatory elements of the hawks genes, which is answer choice d the correct answer since we know that the hawks genes regulate the expression of the genes that are responsible for the segmental patterning and the like development, which means that the changes in the expression of those genes can result in those alterations such as having legs on almost every segment. So answer choice D is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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