PATHOLOGY

Detailed explanation-1: -Traits that show a large number of phenotypes are usually controlled by many genes. With multiple genes and two or more alleles for each gene, there are many possible combinations of alleles and phenotypes.

Detailed explanation-2: -Polygenic inheritance is also involved in quantitative traits, in which multiple gene loci each contribute in a similar way to the phenotype so that the total number of contributing alleles determines the phenotype.

Detailed explanation-3: -A pleiotropic gene is a single gene that controls more than one trait.

Detailed explanation-4: -The number of phenotypes produced for a given trait depends on how many genes control the trait. 1. Single-gene trait: Single gene that has two alleles. Example: Free earlobes (FF, Ff) or attached earlobes (ff).