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

Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

1. The gene (I) has three alleles.

2. A person will have only two of the three alleles.

3. When \(I^A\) and \(I^B\) are present together, they express same type of sugar.

4. Allele 'i' does not produce any sugar.

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 3. When \(I^A\) and \(I^B\) are present together, they express same type of sugar.

Key idea: In AB blood group, I^A and I^B are codominant and both express their own sugars.

Gene I has three alleles (I^A, I^B, i) and a person carries any two. I^A makes sugar A, I^B makes sugar B, and i makes none. When I^A and I^B are together, they express different sugars (A and B), so statement 3 is wrong.

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

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Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.

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