Sex Linked Problems

1. Mate a colorblind male and a carrier female.
   a) What are the chances of having a normal boy?
   b) What are the chances that their sons will be colorblind?
   c) What are the chances of having a normal girl?
   d) What are the chances that their daughters will be carriers?
   
2. Red-green colorblindness is caused by a sex-linked recessive allele. A color blind man marries a woman with normal vision whose father was color blind. What is the probability that they will have a color blind daughter? What is the probability that their first son will be color blind?
   
3. A man with hemophilia (a recessive, X-linked condition) has a daughter of normal phenotype. She marries a man who is normal for the trait.
   a) What is the probability that a daughter of this mating will be hemophiliac?
   b) What are the chances of having a son with the disorder?
   c) What are the chances of their daughters being a carrier?
   
4. A recessive sex-linked gene (h) located on the X chromosome increases blood-clotting time. This causes the genetic disease, hemophilia.
   

   a) Explain how a hemophilic offspring can be born to two normal parents.
   

    b) Can a female ever develop hemophilia?