6th grade science
posted by Elina on .
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!
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.