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CUET · BIOLOGY · PYQ PAPER 2023

Read the given passage and answer the question.
ABO blood groups in human beings are controlled by the gene I. The plasma membrane of the red blood cells has sugar polymers that protrude from its surfaces and the kind of sugar is controlled by the gene. The gene (I) has three alleles IA, IB and I. The alleles IA and IB produce a slightly different form of the sugar while allele i does not produce any sugar. Because humans are diploid organisms, each person possesses any two of the three I gene alleles, IA and IB are completely dominant over I.
Select the correct option for number of alleles present in ABO blood groups:

  1. A Two different alleles
  2. B Three different alleles
  3. C Four different alleles
  4. D Six different alleles
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Correct Answer

(B) Three different alleles

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Detailed explanation

Three different alleles
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