Question

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

• A. $42\%$
• B. $49\%$
• C. $9\%$
• D. $58\%$

Answer 1

Answer: (A)

$42\%$

Answer 2

According to Hardy-Weinberg principle, the expected frequency of $MN$ -blood group bearing organism is likely to be $p^{2} + 2 pq + q^{2} = 1$ $0.49 + 0.09 + 2x = 1$ $0.58 + 2x = 1$ $2x= 1-0.58$ $=42\%$