Answer to Question #115695 in Genetics for lbaugh082

Question

In humans, diabetes is a sex-linked recessive trait. If a homozygous normal woman and a man, whose mother is a diabetic, have children, what will be the phenotypes and genotypes of their children?

Answer 1

If woman is normal homozygous, she has genotype X^D X^D. If mother of her husband is diabetic, he has genotype X^dY and also is diabetic.So if they have children, they will have such genotypes:

X^DX^d and X^DY

Phenotypes: all girls will get a recessive gene , but will be healthy. All boys will be healthy.

X^D- dominant

X^d- recessive allele( diabetic allele)