A) supplementary
B) pleiotropic
C) epistatic
D) codominant
Correct Answer: B
Solution :
Pleiotropic genes are genes, which influence more than one trait. These genes often has a more evident effect on one trait called major effect and less evident effect on other trait called secondary effect. When a number of related changes are caused by pleiotropic genes, the phenomenon is called syndrome, eg, Sickle cell anaemia. Supplementary genes are two non-alletic genes, in which one type of gene produces its effect whether the other is present or not and the second (supplementary) gene produces its effect only in the presence of first usually forming a new trait. Epistasis is the phenomenon of suppression of phenotypic expression of a gene by a non-allelic gene, which shows its own effect. The gene which masks the effect of another is called epistatic, gene while the one which is suppresed is termed as hypostatic gene. Codominance is the phenomenon, in which both the alleles (dominant and recessive) are equally expressed in the hybrid.
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