Question

If parents with blood groups AB and OO produce six children :

A. three of them will have group B
B. two of them will have group A
C. all the offspring will h ave group O
D. none of them will have group A.

Answer 1

three of them will have group B

Answer 2

There are three different alleles for human blood type, known as I^A, I^B, and i. For simplicity, we can call these alleles A (for I^A), B (for I^B), and O (for i).

Each of us has two ABO blood type alleles, because we each inherit one blood type allele from our biological mother and one from our biological father. A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.

A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father). Since there are 4 different maternal blood types and 4 different paternal blood types possible, there are 16 differnt combinations to consider when predicting the blood type of children.

three of them will have group B and group A offsprings are also possible