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Topic: Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance· Genetics and Evolution

Which of the following characteristics represent 'Inheritance of blood groups' in humans ?a. Dominanceb. Co-dominancec. Multiple alleled. Incomplete dominancee. Polygenic inheritance

1. b, c and e

2. b, d and e

3. a, b and c

4. a, c and e

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Answer: 3. a, b and c

Key idea: ABO blood group inheritance is controlled by one gene with three alleles \(I^A, I^B, i\).

  • Multiple alleles: three alleles exist in the population.
  • Dominance: \(I^A\) and \(I^B\) are dominant over \(i\).
  • Co-dominance: \(I^A\) and \(I^B\) both express in AB blood group.

Incomplete dominance and polygenic inheritance do not apply. So a, b and c are correct: option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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