Answer:
(c) Occasionally, a single gene 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.Similarly, sickle-cell anaemic
individuals suffer from a number of problems, all of which are pleiotropic
effects of the sickle-cell alleles.
Multiple allelism is a series of
three or more alternative or allelic forms of a gene, only two of which can
exist in any normal diploid individual, e.g., genes of blood groups in humans.
Mosaicism describes the
occurrence of cells that differ in their 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).
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