Question
Mon February 20, 2012 By: Ananya Shrivastava

if both the parents have RH positive blood group?what is the probability that their offspring would have RH negative blood group?

Expert Reply
Tue February 21, 2012
That depends on the parents genotype.
Case I:
If both parents are homozygous for Rh positive (++), then there is zero probability of the offspring having negative blood group.
Case II:
If one parent is homozygous (++) and the other heterozygous(+-), the offsprings would be only Rh positive and not negative.
Case III:
If both parents are heterozygous (+-), then only would there be a chance for about 25% of the offsprings to be Rh negative.
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