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  4. What can be the blood group of offspring when both parents have AB blood group ?

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Q. What can be the blood group of offspring when both parents have $AB$ blood group ?

Principles of Inheritance and Variation

Solution:

When both parents have blood group $AB \,(I^AI^B)$ then offsprings can have blood groups $A\, (I^AI^A)$, $B \,(I^BI^B)$ or $AB \,(I^AI^B)$ but not $O$ as allele $i$ is not present in any of the parents.