Fundamentholfundamenthol
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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