Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 1

A polygenic trait is the one that is governed by more than one gene. Human skin colour is a polygenic trait governed by more than one gene, where dominant allele of each gene express only a part of trait and the full trait is expressed only in the presence of dominant alleles of all multiple genes. It is called as polygenic inheritance. These genes control skin pigmentation only, no other phenotypic trait is affected by these genes. This makes option A correct.