Red-Green Color blindness in humans is caused by a recessive allele on the X chromosome. A human female with normal color vision, but whose father had red-green colorblindness, marries a male who has normal red-green color vision.

a.) What proportion of their male progeny will have normal color vision?

b.) What proportion of their female progeny will have red-green blindness?

c.) What proportion of their female progeny will possess the allele for red-green color blindness?

d.) If one of their son (of the above couple) with normal color vision marries a women with red-green color blindness, what is the probability that the biological son of this couple will show the trait for red-green color blindness.