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Topic: Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance· Genetics and Evolution

As per ABO blood grouping system, the blood group of father is B^+, mother is A^+ and child is O^+. Their respective genotype can beA. I^Bi / I^Ai / iiB. I^BI^B / I^AI^A / iiC. I^AI^B / iI^A / I^BiD. I^Ai / I^Bi / I^AiE. iI^B / iI^A / I^AI^BChoose th…

As per ABO blood grouping system, the blood group of father is \(B^+\), mother is \(A^+\) and child is \(O^+\). Their respective genotype can be

A. \(I^Bi\) / \(I^Ai\) / \(ii\)

B. \(I^BI^B\) / \(I^AI^A\) / \(ii\)

C. \(I^AI^B\) / \(iI^A\) / \(I^Bi\)

D. \(I^Ai\) / \(I^Bi\) / \(I^Ai\)

E. \(iI^B\) / \(iI^A\) / \(I^AI^B\)

Choose the most appropriate answer from the options given below :

1. D & E only

2. A only

3. B only

4. C & B only

1 answer

Best answer

Answer: 2. A only

Key idea: a child with blood group O must be ii, getting one i allele from each parent.

So both parents must carry i: father (B group) is IBi, mother (A group) is IAi, child ii. This is set A.

In B the parents are IBIB and IAIA, which cannot give i. In C the father is AB, not B. In D the father is group A and the mother group B (reversed), and the child is A. In E the child IAIB is AB. Only A fits: option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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