3) In humans, hemophilia (a disease that affects the bloodclotting process) is x-linked. A young man, John,
has hemophilia but his parents do not.
a) What are the genotypes of John and his parents?
b) If John’s parents have additional children, what are theprobabilities that John’s future sisters and
brothers will not have hemophilia?
c) Of John’s 4 grandparents, only his father’s father hashemophilia. What are the possible genotypes
of the 4 grandparents? From which of the grandparents could Johnhave inherited hemophilia?
