Normal male:
Genotype of parents: XhY, XhXh
Genotype of gametes: XhY, XHXh
Genotype of offsprings: XHY, XhY, XHXh, XhXh
Phenotype of offspring:
1 female with haemophilia, 1 son with haemophilia, 1 normal female, 1 normal son.
Normal female:
Genotype of parents: XhY, XhXh (could be the same punnet square)
Genotype of gametes: XHY, XhXh (A normal female cannot have a son with haemophilia)
Genotype of offspring: XHXh, XhY, XHXh, XhY
Phenotype of offspring:
2 normal son, 2 female with haemophilia.
What is the probability of the couple having a daughter with haemophilia?
with the normal male: 25% 1/4
with the normal female: 50% 1/2
What is the probability of the couple having another son with haemophilia?
with a normal male: 25% 1/4
with a normal female: 0% none
