Hemophilia is a sex linked recessive disorder. A hemophiliac woman has a mother

without the disorder. Determine the genotypes of the woman's

mother and father

Answer: Using H as the allele,

Father - Hh or hh

Mother - Hh

Explanation:

Both parents must have at least one recessive gene to pass down to the hemophiliac woman. The mother does not have the disorder, so she must be heterozygous. No information is given on the father, but he must have passed down at least one recessive allele, so he cannot be homozygous dominant.