Form a small discussion group and decide on the most lik...

Question

Form a small discussion group and decide on the most likely genetic explanation for each of the following situations;

A man who has red–green color blindness and a woman who has complete color vision have a son with red–green color blindness. What are the genotypes of these three people, and how do you explain the color blindness of the son?

Accepted Answer

Hello, everyone and welcome to today's video. So which of the following could be the genotypes of a couple who have a color blind child but are not themselves color blind. And this is very important information. Let's go over each of our answer choices so that we may start solving the problem. As answer choice. A, we have unaffected male and affected female as answer choice B we have affected male and carrier female as answer choice C we have unaffected male and carrier female and as answer choice D we have unaffected male and unaffected female. Well, we are told that the parents remember that these color blind is an X linked recessive trait. This means that only the males only need one X chromosomes or the only X chromosomes that they have to be affected. In order for them to display this trait, we're told that the father is not displaying this trait, meaning that the father has a genotype that is unaffected by these linked recessive disease. So we are already determine the genotype of the father. And we're going to be eliminating all answer choices that say otherwise in this case, it's going to be answer choice B that gets eliminated. Now on to the genotype of the mother, we're told that the mother is also unaffected. However, we're told that the child is affected. So if we have an unaffected father and that's being crossed with the mother to create an affected child, this mother must have some type of affected chromosome in order to make this happen just to be either a carrier or she has to be affected. However, we're told that she is not affected or not themselves color blind, meaning that she's going to be a carrier or unaffected by it. Now, if she is a carrier, we have established the genotype of both the father and the mother. And if we look at our answer choices, answer choice see is going to be the correct one which established that the correct genotypes are an affected father and carrier mother. I really hope this video helped you and I hope to see you on the next one.

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