Assume that on rare occasions the attached X chromosomes in female gametes become unattached. Based on the parental phenotypes in Problem 12, what outcomes in the F₁ generation would indicate that this has occurred during female meiosis?

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Hey, everyone. Let's take a look at this question together of the following alos which one will give rise to a meta female Drosophila? Is it answer choice A two autosome and three X chromosomes? Answer choice B, three AES and four X chromosomes. Answer choice C three artoms and one X chromosome or answer choice D both answer choice A and answer choice. B let's work this problem out together to try to figure out which of the following answer choices will give rise to a meta female Drosophila. So we know that when we're talking about those Drosophila flies, that the sex of the Drosophila fly is determined by that X to a ratio which the X is the X chromosomes and the A refers to the autosome. And so we have that X chromosome to autosome ratio and the met a female. So is determined by having that X to a ratio greater then one meaning that any X to a ratio, which is that X chromosome to autism ratio, greater than one will result in that meta female Drosophila. So looking at our answer choices, we can calculate the X chromosome to autism ratio to determine the sex of the Drosophila fly. And so answer choice A, we can see that we have two Audis and three X chromosomes, which means that our X to A ratio is 3 to 2, which we can calculate the value by dividing three, divided by two, which equals 1.5, which is greater than one. So answer choice A will result in a meta female droop of fly. So we can go ahead and mark it as a potential answer. But let's continue with the rest of the answer choices to determine if answer choice A is the only correct answer here. So we can continue with answer choice B where we have three ooms and four X chromosomes which gives us a 4 to 3 ratio which when we do four divided by three, we are given that X to a ratio value of 1.33, which is also greater than one. So answer choice B will also result in a meta female Drosophila. And then lastly answer choice C, we have three Audis and one X chromosome, which means that our X to A ratio is 123 which when we calculate one divided by three, we are given 0.33 which is not greater than one. So answer choice C is incorrect and answer choice A and B are both correct answers since they both will give rise to a meta female Drosophila. So answer choice D both answer choice A and answer choice B is the correct answer because we know that the sex of the Drosophila fly is determined by that X to a ratio, which is the ratio of X chromosomes, two ooms and a meta female Drosophila fly is categorized as having that X to a ratio greater than one which we know that answer choice A and answer choice B result in that X to a ratio equaling a value that is greater than one. So answer choice D both answer choice A and answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Assume that on rare occasions the attached X chromosomes in female gametes become unattached. Based on the parental phenotypes in Problem 12, what outcomes in the F₁ generation would indicate that this has occurred during female meiosis?

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Key Concepts

Attached X Chromosomes in Female Meiosis

Parental Phenotypes and Genetic Linkage

Meiotic Segregation and Recombination Outcomes