A) Mutation
B) Pleiotropy
C) Epistasis
D) Polygenic inheritance
Correct Answer: D
Solution :
The phenotype of an individual depended on its genotype at all the relevant loci, with each allele adding a small amount. Traits that have this feature are called polygenic, ie, the genes, which are non-allelic and affect the phenotype of a single quantitative trait are called polygenes and their inheritance is called polygenic inheritance. This is proved by Nileson-Ehle in 1908 for kernel colour in wheat. The term pleiotropy refers to the situation in which a gene influences more than one trait. The \[Hb_{B}^{S}\] allelic provides a classic example of pleiotropy. In epistasis an allele of one gene obliterates the phenotypic expression of all allelic alternatives of another gene.
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