Which blood clotting factors are deficient in Hemophilia-$A$,Hemophilia-$B$,and Hemophilia-$C$,respectively?

Sickle-cell anaemia has not been eliminated from the African population because it

$A$ son of a colourblind father and a normal homozygous mother marries a daughter of a normal father and a heterozygous (carrier) mother. What will be the phenotype of their children?

$A$ normal woman,whose father was colourblind,marries a normal man. What kinds of children can be expected and in what proportion?

$A$ normal-visioned man whose father was colour-blind,marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?

In Cooley's Anemia,the affected chain of a haemoglobin is