A man having blood group O marries a woman having blood group AB . what will be the blood group of their offspring?

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Solution

Man has blood group O, hence his genotype is I^OI^O. The woman has blood group AB , hence her genotype is I^AI^B. We can predict the probability of the blood group of their offspring by studying the Punnet Square given below

Gametes I^O I^O

I^A I^AI^O I^AI^O

I^B I^BI^O I^BI^O

Since I^A and I^B are dominant alleles and I^O is the recessive allele, there is a 50% chance of an offspring to possess blood group A and 50% chance of an offspring to have blood group B.

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