For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The

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For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be

Accepted Answer

Sol.(a) [Key Concept: MN Blood Group — Hardy–Weinberg (2pq)] Using Hardy-Weinberg equation: p² + 2pq + q² = 1, where p (M allele) = 0.7 and q (N allele) = 0.3. Frequency of MN (heterozygous) = 2pq = 2 × 0.7 × 0.3 = 0.42 = 42%. p² (MM) = 0.49 = 49%; q² (NN) = 0.09 = 9%. The expected frequency of MN blood group is 42%.

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