Match the following related to combination of parents' blood groups and possible blood types of children.
Column - I Column - II
P. A and B 1. A,B, AB
Q. AB and AB 2. A,B
R. O and AB 3. O
S. O and O 4. A,B, AB,O
P - 4, Q - 1, R - 2, S - 3
If parents possess heterozygous A and B groups, children would possess either A, B, AB or O blood group. If both parents have AB group , the children would possess either A, B or AB blood group. If parents have O and AB groups , children could have either A or B blood groups. If parents possess O group, children will possess only O blood group