Question

About 80% of the human population can taste the chemical phenolthiocarbamide(PTC)" while the otter 20% can't. This characteristic is governed by a single gene with two alleles, a tasting allele and a non-tasting allele. What does this statistic tell us about which allele( tasting or non-tasting) is dominant?​

Answer 1

The tasting allele is dominant.

Step-by-step explanation:

• The law of dominance states that the dominant allele will always express itself in homozygous or heterozygous conditions.
• While, the recessive allele Can express itself only in Homozygous recessive condition.
• The phenotypic ratio in case of monohybrid cross is 3:1 where i.e , about 3 out of every four offspring tends to express the dominant trait.
• According to the given statistics,80% of the population can taste PTC and 20 % cannot.
• Thus The tasting allele is a dominant allele.