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NEETZoologyPrinciples of Inheritance and Variation

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A couple where one parent has blood group AB and the other has blood group O can never produce a child with blood group AB or blood group O. Reason (R): The allele i for blood group O is codominant with both I^A and I^B alleles. In the light of the above statements, choose the most appropriate answ

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

C. Assertion (A) is true but Reason (R) is false

Step-by-step solution

The Assertion (A) is true. A parent with blood group AB has the genotype I^A I^B and will produce gametes containing either the I^A or I^B allele. The parent with blood group O has the genotype ii and will produce gametes containing only the i allele. When these gametes fuse, the resulting progeny can only have the genotypes I^A i (blood group A) or I^B i (blood group B). Therefore, it is impossible for them to have a child with blood group AB ( I^A I^B ) or O ( ii ). The Reason (R) is false. The alleles I^A and I^

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