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Q102 (IAS/1994) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Genetics and evolution Answer Verified

If father has blood group A and mother has blood group O, then which one of the following blood group may be found in their son ?

Result
Your answer: —  Â·  Correct: C
Explanation

ABO blood type is determined by alleles A, B and O; A and B are co-dominant while O is recessive. A father with phenotype A can be genotype AA or AO, while a mother with phenotype O must be OO. Each child inherits one allele from each parent. If the father is AO, possible offspring genotypes are AO (phenotype A) or OO (phenotype O). If the father is AA, all children will be A. Therefore, a child of an A father and O mother can be blood group A or O; O is explicitly possible and thus may be found in their son [1].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 8: Heredity > QUESTIONS > p. 133
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