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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 man with blood group O cannot be the biological father of a child with blood group AB, regardless of the mother's blood group. Reason (R): Blood group O individuals have the genotype ii and can only pass on the i allele, whereas a child with blood group AB must inherit an I^ A allele from one par

Options

  1. ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
  2. B(A) is correct but (R) is not correct
  3. CBoth (A) and (R) are correct and (R) is the correct explanation of (A)
  4. D(A) is not correct but (R) is correct

Correct answer

C. Both (A) and (R) are correct and (R) is the correct explanation of (A)

Step-by-step solution

Assertion (A) is correct: A child with blood group AB has the genotype I^ A I^ B . This means the child must inherit the I^ A allele from one parent and the I^ B allele from the other parent. A man with blood group O has the genotype ii and can only produce gametes containing the i allele. Therefore, he cannot provide either the I^ A or I^ B allele required for an AB blood group child, making it impossible for him to be the biological father. Reason (R) is correct: It accurately states the genotype of blood group O

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