Avery common type of red/green color blindness in humans is caused by a mutation in a gene located on the x chromosome. knowing that the mutant allele is recessive to the wild-type, what is the probability that the son of a woman whose father is colorblind is going to also be colorblind?
a) 0%
b) 25%
c) 50%
d) 75%
e) 50%