Contrast the XX/XY and XX/X0 modes of sex determination.

Question

Accepted Answer

Hey everyone, let's take a look at this question together in the blank sex determination system, sex is decided by the presence or absence of a chromosome. But in the blank scheme the Y chromosome, maybe sex determining. Let's take a look at the different types of patterns in our answer choices to figure out which one best fits the question. Starting off with the X. X. X. O. Pattern. Males are classified as X. O. Because they have a single X chromosome and they produce two types of sperm. You have one with the X. Chromosome and then you have one without. Since there is no Y chromosome in this pattern, which is why the males are labeled as that ex O. In the X. X. X. Y. Y pattern. This one is more traditional where you have the two types of sperm that contain either the X. Or the Y. Meaning that the female gets the X. X. And the mail. It's the X. Y. And then, lastly, you have the X. Y. X. X pattern, which is the opposite of the X. X. X. Y. Pattern. In that the females are the ones that get the X. Y pairing of chromosomes instead of the males. So looking at the question, it says in the blank sex determination system, sex is decided by the presence or absence of chromosome. Now looking at the ones that we have listed below which of the following as sex being decided by the presence or absence of chromosome that would be the X. X. X. O. Because we know that we have either with the X. Chromosome or without is what determines whether the sex is male or female. And then in the scheme where the Y chromosome is the one that determines that sex, we know that it's that X. X. X. Y. Because it's that Y chromosome that determines the sex because both of them received that X chromosome, but only the males received the that would make the correct answer answer choice. A Because we know that in the sex determination system where sex is decided by the presence or absence of chromosome, we have the X. X. X. O. And then in the scheme where the Y chromosome is that sex determining factor we have the X. X. X. Y. Which is answer choice A The correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Contrast the XX/XY and XX/X0 modes of sex determination.

Key Concepts

XX/XY Sex Determination

XX/X0 Sex Determination

Sex Determination Mechanisms

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