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NEET2010ZoologyPrinciples of Inheritance and VariationActual

ABO blood groups in humans are controlled by the gene I. It has three alleles - I ^ A , I ^ B and i . Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

Options

  1. AThree
  2. BOne
  3. CFour
  4. DTwo

Correct answer

C. Four

Step-by-step solution

In ABO blood group system, inheritance of grouping is controlled by a single autosomal gene on chomosome 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, four blood groups (phenotypes) have been differentiated-A, B, AB and O blood groups.

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