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NEET2020ZoologyPrinciples of Inheritance and VariationActual

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

Options

  1. AA person will have only two of the three alleles.
  2. BWhen I A and I B are present together, they express same type of sugar.
  3. CAllele ‘i’ does not produce any sugar
  4. DThe gene (I) has three alleles.

Correct answer

B. When I A and I B are present together, they express same type of sugar.

Step-by-step solution

For the ABO system of blood groups, allele I A produces N acetylgalactosamyl transferase enzyme which recognizes H antigen present in RBC membrane and adds N-acetylgalactosamine to sugar part of H antigen to form A antigen. The allele I B produces galactosyl transferase enzyme which adds galactose o the sugar part of H antigen to form B antigen. Allele 'i' does not produce any sugar or antigen. When both I A and I B are present in a person, both enzymes thus both antigens A and B are produced. This is becau

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