The Possible Genotypes and Phenotypes for Single Gene Trait Showing Dominance

How many possible genotypes and phenotypes are there for a single gene trait that shows dominance in any given population?

A) One genotype, one phenotype B) Two genotypes, two phenotypes C) Three genotypes, two phenotypes D) Two genotypes, three phenotypes

The Possible Genotypes and Phenotypes for Single Gene Trait Showing Dominance

Hi! The answer is C) Three genotypes, two phenotypes. Hope this helps! -Payshence xoxo

For a single gene trait that shows dominance in any given population, three genotypes and two phenotypes are possible. Let us assume that the dominant single gene trait is represented by A. Genes always exist in alternate pairs or alleles.

The alternate version of A could also be A. This will result in AA genotype and dominant phenotype. The alternate version of A could be a. This will result in either Aa or aa genotypes. Aa genotype will result in a dominant phenotype while aa genotype will result in a recessive phenotype.

Thus, there are 3 possible genotypes while only 2 phenotypes are possible from a single gene trait that shows dominance.