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Ch. 7 - Sex Determination and Sex Chromosomes

Chapter 7, Problem 11

What is the basis for homology among chromosomes?

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Hello everyone and welcome to today's video. So what is the significance of home ology among chromosomes? Well, remember that homologous chromosomes or homologous traits has a meaning to it. In this case homologous traits or homologous chromosomes refers to these structures that are similar to one another due to a shared ancestry. Because of this, they're going to have similar functions or they're going to look similarly knowing that let's go over each of our answer choices so that we can solve this problem. Beginning by answer choice. It is an indication of a genetic disorder, all that the two chromosomes or homologous does not really refer to a genetic disorder. So we're going to cancel this out than we have. It is related to the age of an organism. Well, it is more related to the relationship that these two organisms are going to have to one another or these two chromosomes are going to have to one another. It is not related to the age of the organisms themselves. So we're going to cancel this out. Then we have deep it is related to the size of the organism. Will remember again that this is more related to the relationship, not the size. So we're going to cancel this out. Then we have a provides evidence of common ancestry between different organisms. So here we have the relationship being common ancestry that they come from a common ancestor. And we know that because these chromosomes are homologous or similar to one another. Because of this answer choice. A correctly describes what the home ology among chromosomes is representing. And we're going to highlight it as a final answer to our question. I really hope this video helped you, and I hope to see you on the next one.
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An insect species is discovered in which the heterogametic sex is unknown. An X-linked recessive mutation for reduced wing (rw) is discovered. Contrast the F₁ and F₂ generations from a cross between a female with reduced wings and a male with normal-sized wings when the male is the heterogametic sex.

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