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  4. If the genotypes determining the blood groups of a couple are IAIO and IAIB, then the probability of their first child having type O blood is is

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Q. If the genotypes determining the blood groups of a couple are $I^{A}I^{O}$ and $I^{A}I^{B}$, then the probability of their first child having type O blood is is

KVPYKVPY 2018

Solution:

The genotype of child having blood group-0 with parents having $I^{A}I^{O}$ and $I^{A}I^{B}$ blood groups can be represented as
image
From the above cross, it is shown that none of the off springs will be of blood group-O.
$\therefore $ The probability of their first child having type-0 blood is zero