Question 7. Hemophilia is a blood disease caused by a mutated coagulation factor
gene found on the X chromosome. Therefore, it is referred to as a sex-linked disease.
People with hemophilia have severely reduced ability to clot their blood making
them bleed easily from even the smallest injury. The recessive allele (the mutant
allele) causes the disease, whereas the dominant allele does not. A woman with
normal blood but whose father had hemophilia ended up having a son and a
daughter with a man who has hemophilia. (remember the birth sex of females is XX
and the birth sex of males is XY). (2pts)
(a) What is the probability that their son will have hemophilia?
(b) What is the probability that their daughter will have hemophilia?
(c) How would these probabilities be different if neither birth parent had hemophilia?