The homeotic mutation Antennapedia causes mutant Drosophila to have legs in place of antennae and is a dominant gain-of-function mutation. What are the properties of such mutations? How does the Antennapedia gene change antennae into legs?

Video transcript

Hey, everyone. Let's take a look at this question together. How does a mutation in the antenna PD A gene affect the body? So let's recall what the purpose of the antenna PD A gene is. And if it was mutated, how it would affect the body. Well, we note that the antenna PD A gene is the gene that is responsible responsible for the development of specific body parts in organisms which include the antennae and the legs. And we know that the antenna PD A gene is a homo box jean which regulate the expression of other genes within the organism. And these other genes are those that control development. And so when we have that mutation in this gene, the mutation can alter the expression of jeans that control leg development, which can lead to the development of extra legs. So that means that answer choice. A is the correct answer because this antenna PD A gene which is the gene that is responsible for the development of specific body parts in an organism, which include the antenna and the legs. And it is a homo box gene which regulates the expression of other genes, which means that a mutation in that gene can alter the expression of genes that control leg development leading to extra legs. So answer choice A is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.