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# Exam tommorrow, please help with one question i don't understand?

The frequency of individuals who cannot taste phenylthiocarbamide (PTC) is approximately 0.3. The inability to taste this bitter substance is due to a recessive allele. Assume that there are only two alleles in the population (namely, tasters, T, and nontasters, t) and that the population is in Hardy-Weinberg equilibrium. What is the frequency of the recessive allele in the population?

A. 0.45

B. 0.30

C. 0.15

D. 0.55

Please provide an explanation to your answer

### 1 Answer

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- 8 years agoFavorite Answer
q^2 = 0.3

Recessive allele refers to just q.

So, take the square root and voila, youre done.

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