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What Are Alleles

The ability t...

Question

The ability to taste the bitter chemical PTC is inherited as a simple dominant trait. In a population of 1000 biology students, 640 of them are PTC tasters. What proportion of this population are non-tasters?

A

0.64

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B

0.08

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C

0.06

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D

0.36

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E

0.42

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Solution

The correct option is D 0.36
Phenylthiocarbamide (PTC) tasting is a trait governed by a pair of alleles, where dominant T is for tasting and recessive t is for non-tasting. The ability to taste the bitter chemical PTC is inherited as a simple dominant trait. TT and Tt are tasters and tt are non-tasters.
If the total population is of 1000, and 640 are tasters. It means that 360 are non-tasters.
So, the correct answer is option D.

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