Occasionally, a single gene may express more than one effect. The phenomenon is called

Options

A. multiple allelism
B. mosaicism
C. pleiotropy
D. polygeny

Answer

C

Explanation

Occasionally, a single gane may express more than one trait. This phenomenon is called pleiotropy. Sometimes, one trait will be very evident and others will be less evident, e.g., a gene for white eye in Drosophila also affect the shape of organs in male responsible for sperm storage as well as other structures.
Similary, sickle-cell anaemic individuals suffer froma a number of problems, all of whihc are pleiotropic effects of the sickle-cell alleles.
Multiple allelism is a seies of three or more alternative or allelic froms of a gene, only tow of whihc can exist in any normal dipolid individual, e.g., genes of blood groups in humans.
Mosaicism describes the occurrence of cells that differ in thier genetic component from other cells of the body.
Polygeny refers to a single characteristic that is controlled by more than two genes. (it is also known as multifactorial inheritance).