A disease caused by an autosomal primary non-disjunction is :

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Among the following characters, which one was not considered by Mendel in his experiments on pea?

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is