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UPSC 2011: A married couple adopted a male child. A few years later twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is
(a)O positive
(b)A positive
(c)B positive
(d)Cannot be determined on the basis of the given data
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Not attemptedCorrect Answer: (a) O positive
An AB (genotype IAIB) parent crossed with an O (genotype ii) parent can produce children with phenotypes A (IAi) or B (IBi) only; type O offspring are genetically impossible. Hence among the three boys (A⁺, B⁺, O⁺) the O⁺ child must be the adopted one, making option (a) correct. ([testbook.com](https://testbook.com/question-answer/a-married-couple-adopted-a-male-child-a-few-years--602123a6951004394b5e43a3?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2011 Science & Technology question?▼
The correct answer is option (a): O positive. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biotechnology & Genetics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2011, GS Paper 1, as Question 66. It falls under Science & Technology > Biotechnology & Genetics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Biotechnology & Genetics?▼
UPSC has asked 54 questions from Biotechnology & Genetics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.