Each member of a class sampled a piece of PTC testing paper. Thirty people sampled the chemical. Twenty persons were tasters. How many had heterozygous genes? 10 20 0-20 indeterminate

Each member of a class sampled a piece of PTC testing paper. Thirty people sampled the chemical.

Twenty persons were tasters. How many had heterozygous genes?

10
20
0-20
indeterminate

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