Question

Mary has type a blood and her husband (john) has type b blood. john's parents both had type ab. mary and john have three children, one with type a, one with type ab, and one with type

b. relatives suspect that one of the children was adopted. what are mary and john's blood genotypes, which child was adopted?

Answer 1

Genotype of John = Ib Ib

& genotype of mary could be either Ia Ia or Io Io

So, child could not have a blood group.....