Question 1
A woman heterozygous for color blindness (an X-linked recessive allele) marries a man with normal color vision. What is the probability that their first child will be color-blind?
◦ 25 percent
◦ 50 percent
◦ 75 percent
◦ 100 percent
◦ 0 percent
Question 2
A woman is diagnosed as having the genetic disease known as Huntington's disease. It is a rare defect caused by an autosomal dominant allele. The chance for any one of her eggs to carry the gene is
◦ dependent on the sex of the child.
◦ 1 out of 3.
◦ dependent on the genotype of the woman.
◦ 3 out of 4.
◦ 0.