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NEET 2026, Biology Q53: Mendel's laws of Inheritance

NEET2026Biology
Q.

What is the probability of having children with ‘O’ blood group, where both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively?

  1. A

    25%

  2. B

    0%

  3. C

    75%

  4. D

    50%

Solution

Mother (heterozygous A) has genotype Ii and father (heterozygous B) has genotype Ii.

The cross Ii × Ii produces four equally likely offspring genotypes: II (AB), Ii (A), Ii (B) and ii (O).

Only one of the four (ii) has the O blood group, giving a probability of .

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