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6th grade science

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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?

I don't know how to do this please help!

  • 6th grade science -

    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.

    With that information, you should be able to get the parental genotypes.

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