Question

A baby is born with type A blood.His father is also type A but his mother is type AB.

1. How is this possible?
2. If his mother needs a blood transplant, can he be a blood donor?
3. If he needs a transplant, can his mother donate to him?

Answer 1

According to ABO blood group system, a person with A blood group have two alleles, either both alleles of A, or one A allele and one O allele. In this case, child mother have AB blood group, which means she have two alleles,A and B.Child father is A blood group, means his blood genotype will be either both A alleles or one A and one O allele. Here a child will get one allele from mother and one from father. Child got one A allele from his father and one A allele from mother. That's what his blood group is A .A and B are dominant alleles.

AB blood group is universal receiver. Since they have both A and B alleles, they can receive blood from any blood group. Her son have A blood group. So it's matching, so she can take his body part for transplant.

Child can't use his mother body part for transplant. Because he is A blood group, he need transplant from A or O blood group person