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Principles of Inheritance and Variation
ABO blood group inheritance
2 questions from 2 papers, each with its answer.
- questions
- 2
- papers
- 2
- years asked, 2017–2026
- 2 of 10
- of Principles of Inheritance and Variation
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Appears in
Concepts tested
- ABO blood group inheritance
All Questions
2026 1 question
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What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively?
2024 Re-NEET 1 question
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The mother has $A^+$ blood group the father has $B^+$ and the child is $A^+$. What can be the possibility of genotypes of all three, respectively?Since the child is $A^+$ and the father is $B^+$, the child must have received the $I^Bi$ allele combination from the father contributing $i$, meaning the father's genotype must include $i$ (i.e. $I^Bi$). The mother, being $A^+$, can be $I^AI^A$ or $I^Ai$. Consistent possibilities for (mother, father, child) genotypes are: $I^AI^A\,|\,I^Bi\,|\,I^Ai$ (option B) and $I^Ai\,|\,I^Bi\,|\,I^Ai$ (option E) — so the answer is B and E.