Multiple choice

If frequency of dominant phenotype is 75%, find out frequency of recessive allele.

  1. 50%

  2. 25%

  3. 100%

  4. 75%

  5. 5%
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A Correct answer
Explanation

As p2+2pq refers to frequency of dominant phenotype therefore   p2 + 2 pq = 75 % (given) p2 + 2 pq + q2 = 1 then 0.75 + q2 = 1 so q2 = 0.25 thus q = 0.5.Therefore frequency of recessive allele is 50 %.

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