If a female has 'A' blood group and her husband has 'O' blood group, then the blood group of their children would possibly be:

Explanation

Option B is correct. The blood group of the children of a woman with type A blood and a man with type O blood can only be type A or type O. The ABO blood group system is determined by the presence of three different alleles of the ABO gene: A, B, and O. The A allele is responsible for the production of the A antigen, the B allele is responsible for the production of the B antigen, and the O allele is responsible for the production of neither antigen.If a woman has type A blood, she must have one A allele and one O allele. If a man has type O blood, he must have two O alleles. The children of this couple will inherit one allele from each parent. There are two possible genotypes for the children: AO and OO. If the children have the AO genotype, they will have type A blood. If the children have the OO genotype, they will have type O blood. It is not possible for the children to have type B blood, because the B allele is not present in either parent.