The existence of more than two allelic forms of a particular gene is termed as

Pleiotropy

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Polygenic traits

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Epistasis

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Multiple allelism

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Solution

The correct option is D
Multiple allelism

In human beings, ABO blood groups are controlled by the gene I which has three alleles- $I^{A}, I^{B} a n d I^{O}$ . This phenomenon is known as multiple allelism.

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Similar questions

	I		II
A	Dominance	i	In a heterozygous organism both alleles express themselves fully
B	Epistasis	ii	A single gene influences many characters
C	Pleiotropy	iii	One gene is suppressed by other gene.
D	Codominance	iv	One allele masks the other allele of the same gene

Column I	Column II
Pleiotropic gene	Both allele express equally
Codominance	Change in nucleotide
Epistasis	One gene shows multiple phenotypic expression
Mutation	Non - allelic gene inheritance

	Column I		Column II
A.	A single trait controlled by three or more than three alleles	(i)	Pleiotropy
B.	A single trait controlled by three or more than three genes	(ii)	Multiple alleles
C.	A single gene exhibits multiple phenotypic expression	(iii)	Polygenic inheritance

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