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Principles of Inheritance and Variation
Multiple alleles - ABO blood groups
4 questions from 4 papers, each with its answer.
- questions
- 4
- papers
- 4
- years asked, 2017–2026
- 3 of 10
- of Principles of Inheritance and Variation
- 2.02%
Appears in
Concepts tested
- Multiple alleles - ABO blood groups 2
- abo-cross-genotypes-phenotypes
- Antigens and antibodies in AB blood group
All Questions
2026 Re-NEET 1 question
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For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?Reference: NCERT Class XII, page 61.
2019 Odisha 1 question
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In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents?
2017 1 question
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The genotypes of a Husband and Wife are $I^AI^B$ and $I^Ai$. Among the blood types of their children, how many different genotypes and phenotypes are possible?
Four genotypes collapse into three phenotypes (A, AB, B).
Husband $I^AI^B$ × Wife $I^Ai$ Offspring: $I^AI^A$, $I^AI^B$, $I^Ai$, $I^Bi$ Number of genotypes = 4 $I^AI^A$ and $I^Ai$ = A; $I^AI^B$ = AB; $I^Bi$ = B Number of phenotypes = 3
2004 AIPMT 1 question
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In the ABO system of blood groups if both antigens are present but no antibody, the blood group of the individual would be :-Blood group A has antigen A on the RBCs and anti-B antibodies in the plasma.
Blood group B has antigen B and anti-A antibodies.
Blood group AB has both antigens A and B, and no antibodies (so it is the universal recipient).
Blood group O has no antigens and both anti-A and anti-B antibodies (universal donor).
So an individual with both antigens and no antibody has blood group AB (genotype $I^AI^B$, an example of codominance).