Can O Negative And B Postive Blood Group Parents Have A Ab Positive Blood Group Child?
A person of AB blood group has to inherit the B allele from one parent and the A allele from the other parent and in the example given an AB child is impossible because the o parent can only pass on the o allele as it is a recessive trait. This same o neg parent can only pass on for neg. Because RH. Neg is also a recessive trait. Just like the o. The (B) pos. Parent can obviously pass on for the dominant allele + even though they may be heterozygous for the rhesus factor , so yes a pos group child is possible but not an AB child.