NEET BIOLOGY

Detailed explanation-1: -In normal conditions there are only 2 alleles present for controlling one trait. When there are three or more alternative forms of a gene, it is called multiple allelism and some genes could have more than two alternative allelic forms. When a single gene has more than one effects, it is called pleiotropy.

Detailed explanation-2: -A pleiotropic gene is a type of gene that controls multiple phenotypic traits in an individual. A pleiotropic gene affects metabolic pathways which give rise to diverse traits.

Detailed explanation-3: -When a single gene has more than one effects, it is called pleiotropy.

Detailed explanation-4: -When there is a gene existing in more than two allelic forms, this condition is referred to as multiple allelism. Allelism refers to any of the several forms of a gene. These genetic variations arise usually through mutation and therefore are responsible for hereditary variations.