Hemophilia is a sex‐linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman who is a heterozygous carrier?
Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait and therefore occurs only in individuals who are homozygous recessive. Which set of parents can have a child with type O blood?