Question

A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning.

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The gene for hemophilia is sex-linked, a recessive on the X-chromosome. The daughter must have both Xs with the gene, while the son does not have the gene on his X chromosome.

Where do I go from there? Please help me I'm having a very hard time trying to understand this

Answer 1

Since the son gets the X from mom, she is heterozygous for that gene, a carrier.

The daughter has to get XX, both with hemophilia, one from each parent. That must mean that dad has hemophilia too.

Answer 2

thank you

Answer 3

So does that me she got it right

Answer 4

Tysm for your help! I really did not understand it:(

Answer 5

thank you so much!

Answer 6

Yes

Answer 7

Thanks that was really helpful

Answer 8

just passed it to the daughter

Answer 9

Bunch

Answer 10

What he basically means is that they must both have the disease and so the son will have the disease.