Question

People with blood type AB have both antigen in their RBCs. A and B alleles are known to be what type of phenomenon?

Greg blood type is AB and his wife Susan is blood type A. Is it possible that Susan can have a child with blood type O? Why?

Answer 1

Ans-1- the human ABO blood group is an example of codominance where both allele A and allele B express itself. Apart from that is also the example of multiple allelism.

Ans-2- for blood group O both the alleles should be O (genotype OO) which is not possible in this case because either A or B alleles are dominant over O allele. The offspring will get only one allele O from mother (only if mother genotype is AO) while father will give either allele A or B.

So it is not possible to have a child with blood group O.