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NEET2010ZoologyPrinciples of Inheritance and VariationActual

ABO blood grouping is controlled by gene I, which has three alleles and show codominance. There are six genotypes. How many phenotypes in all are possible?

Options

  1. ASix
  2. BThree
  3. CFour
  4. DFive

Correct answer

C. Four

Step-by-step solution

In ABO blood group system, inheritance of grouping is controlled by a single autosomal gene on chromosome-9 with three major alleles A , B and O ( I ^ A , I ^ B . and . I ^ O ) . The ABO blood group system has at least 6 genotypes. On the basis of presence or absence of antigens and antibodies, 4 blood groups (phenotypes) have been differentiated, ie, A, B, A B and O blood groups.

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