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NEET BIOLOGYPrinciples of Inheritance and VariationMedium

Question

The mother has A+ blood group, the father has B+ and the child is A+. What can be possible genotypes of all three, respectively?

A

IAIA | IBi | IBi

B

IAIA | IBi | IAi

C

IBi | IAIA | IAIB

D

IAIA | IBIB | IAi

Step-by-Step Solution

, ABO blood grouping is controlled by the gene I, which has three alleles: , , and . and are dominant over .

  • Child Analysis: The child is Blood Group A. Possible genotypes are or . Since the father is Blood Group B (genotypes or ), he does not possess the allele to pass on. Therefore, the child cannot be . The child must be , having received from the mother and from the father.
  • Father Analysis: For the father to contribute an allele while being Blood Group B, his genotype must be .
  • Mother Analysis: The mother is Blood Group A and contributes the allele. Her genotype can be or .
  • Conclusion: Option B fits this logic: Mother () contributes , Father () contributes , resulting in a Child () with Blood Group A.

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Principles of Inheritance and Variation. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYPrinciples of Inheritance and Variationmotherfatherpossiblegenotypesrespectively

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