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

11 answers

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.

thank you

Bunch

thank you so much!

So does that me she got it right

Yes

Thanks that was really helpful

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

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

no...

just passed it to the daughter