Question

how many allels are involved in the inheritance of blood groups in humans? There is a boy with blood group A whose mother has blood group B. Give the possible genotype and phenotype of father​

Answer 1

Answer:

3 alleles Ia, Ib and i

possible genotype of father is IaIa or Iai

Explanation:

Since the boy has blood group A and mother has B we can confirm that mother is Ibi because if she was IbIb then that trait would have been shown and boy blood group would have been AB

Now father can be IaIa or Iai

In case of IaIa -

Ia from father × i from mother = A blood group child

In case of Iai -

Ia from father × i from mother = A blood group