Homeotic genes a. encode transcription factors that control the expression of genes responsible for specific anatomical structures. b. are found only in Drosophila and other arthropods. c. are the only genes that contain the homeobox domain. d. encode proteins that form anatomical structures in the fly.

Video transcript

Welcome back. The next problem, says, genes that control the development of anatomical structures in species ranging from kind of germs to insects, mammals and plants are known as and we have choices of four different kinds of jeans. So looking at our question, we have two things that we're looking for. We're looking for the development of structures during during um embryonic development and then we're looking for a wide variety of species that those genes are found in. So let's look and see which of these fit those categories. So we'll kind of go over here and we'll say Development and variety for each one. So looking at our first choice, the hawks genes will do that in purple hawks genes are involved in the development of an anatomical structures along the head to tail axis of an embryo of a mutation of a gene and a fruit fly, you might get a leg developing where um an antenna should be. However, um the hawks genes are found in animals. So we're looking for a gene across a wide variety of species so we can eliminate choice A. So next we'll look at choice B, which is gap jeans. Gap genes are involved in the development of anatomical structures. They're involved in the development of the segmented body parts of some arthropods. So again, that's a more limited category than we're looking for. So we will go ahead and eliminate choice B. The gap jeans. Next, we'll look at the home idiotic jeans choice. See so these are involved in the development of anatomical structures and they are found in a wide variety of species. Uh so that is our correct answer. The homoerotic jeans and in fact, those hawks genes that we saw an answer a are sort of a subset of homoerotic genes. Um but homoerotic is what we're looking for, since we want to see something across a wide variety of species just to be thorough, we'll look at choice D the hetero chronic genes. Um these are involved in development, but um they're involved in the timing of the development of different body parts, so kind of a different sort of function, So not quite what we're looking for, and we will cross off choice D. So again, we're looking at home idiotic genes, anatomical development in a wide variety of species. See you in the next video.