Question

Men have XY (or YX) chromosomes, and women have XX chromosomes. X-linked recessive genetic diseases (such as juvenile retinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is good. In the following, represent a defective X chromosome with lowercase x, so a child with the xY or Yx pair of chromosomes will have the disease, and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child. a. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a son will inherit the disease? b. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a daughter will inherit the disease? c. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a son will inherit the disease? d. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a daughter will inherit the disease?

          Men have XY (or YX) chromosomes, and women have XX chromosomes. X-linked recessive genetic diseases (such as juvenile retinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is good. In the following, represent a defective X chromosome with lowercase x, so a child with the xY or Yx pair of chromosomes will have the disease, and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child.

a. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a son will inherit the disease?
b. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a daughter will inherit the disease?
c. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a son will inherit the disease?
d. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a daughter will inherit the disease?

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Added by Elizabeth M.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

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Solved by Expert Sheryl Ezze

08/18/2022

Step 1

Step 1: For part a, the probability that a son will inherit the disease is 0, as both possible combinations of chromosomes for a son (XY and YX) do not result in the son inheriting the defective X chromosome. Show more…

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Men have XY (or YX) chromosomes, and women have XX chromosomes. X-linked recessive genetic diseases (such as juvenile retinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is good. In the following, represent a defective X chromosome with lowercase x, so a child with the xY or Yx pair of chromosomes will have the disease, and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child. a. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a son will inherit the disease? b. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a daughter will inherit the disease? c. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a son will inherit the disease? d. If a mother has one defective x chromosome and one good X chromosome, and the father has good XY chromosomes, what is the probability that a daughter will inherit the disease?

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Transcript

00:01 Looked at a sex length disease and we have in the first part for a and b we have for a and b we have the father carries that he has the small x and a capital y and the mother has two capital x.

00:22 So she is not a carrier of the disease at all.

00:25 So if we look at the punnet square for the setup, we'll put the father here and and little x and capital y and capital x and capital y.

00:36 We can have a capital x, little x.

00:38 We can have capital x, little x.

00:41 We can have the capital x and capital y and capital x and capital x and y.

00:47 And we want to know in part a, what is the probability that a sun will inherit that gene? and that is, these two are the way.

01:02 Ways to have sons.

01:04 And both sons will not inherit the gene.

01:07 So that is zero.

01:09 Now we want to know what is the probability that a daughter will inherit the gene.

01:18 And now we want to look at just the daughters.

01:21 And so the daughters, i'll do in green, here are the daughters.

01:25 And we're told that they will automatically get the gene, but they won't have the disease.

01:33 So they will have the gene 100 % of these daughters will inherit.

01:42 They'll get that gene.

01:43 However, this capital x and little x, they will not have the disease.

01:54 And i believe the question is asking, inheriting means that they'll just get the gene.

02:01 And we'll just double check recessive gene...

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