Human genetics and blood groups MCQ — 1 Practice Questions with Answers

Human genetics and blood groups is a Science & Technology topic in the RAS/RPSC syllabus. This page gathers exam-style Human genetics and blood groups multiple-choice questions with correct answers and explanations, so aspirants can test recall and revise frequently examined concepts.

Practice 1 Human genetics and blood groups multiple-choice questions with detailed answers and explanations. Ideal for RAS/RPSC exam preparation.

1 Questions Science & Technology

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Q1. How many genotypes of the human ABO blood group are possible?

A 4

B 6 Correct

C 3

D 8

Explanation

The human ABO blood group is controlled by three alleles: IA, IB and i. A genotype is formed by taking two alleles at a time. The possible combinations are IAIA, IAi, IBIB, IBi, IAIB and ii, giving six genotypes in total. Four refers to the phenotypes A, B, AB and O, not genotypes. Three counts only the alleles. Eight is too high because the same two-allele combinations are not counted separately by order.

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