What blood group is possible in children, if the mother has the second blood group

What blood group is possible in children, if the mother has the second blood group, and the father has the fourth. Why? Write the genotype F1

A gene is responsible for blood groups in humans, which is represented by 3 alleles: A, B and O. At the same time, O is recessive in relation to A and B.

Groups 2 and 3 can have both homozygous (AA, BB) and heterozygous (AO. BO) genotypes.

The mother has blood group 2, let’s assume that she is heterozygous (this gives more variants of genotypes).

RR g AO (2) x m AB (4)

m / f A B A AA (2) AB (4) O AO (2) BO (3)
By phenotype:

50% – the second group;

25% – the third group;

25% – the fourth group.

Answer: in children, 2, 3 and 4 blood groups are possible.