Problem:
Red-green colored blindness in humans is the result of an X-linked gene. 2 parents with wild-type vision produce 2 daughters with wild-type color vision and a son that is color blind.
Required:
Question 1: what's the probability that both daughters are carriers for the color-blind allele? Show the pedigree and your calculation.
Question 2: if one of the daughters marries a man with wild-type vision, what is the chance of their having a colored blind son? Explain thoroughly.