If both the alleles of a heterozygote show expression, the phenomenon is called ___.

Pleiotropy

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Polymorphism

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Codominance

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Incomplete dominance

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Solution

The correct option is C
Codominance

The condition in which both the alleles of a heterozygote show individual phenotypic expression is called codominance. For instance, two alleles of the ABO blood groups- $I^{A} a n d I^{B}$ are codominant, in the AB phenotype.

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Similar questions

If both the alleles of a heterozygote show expression, the phenomenon is called

	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

	I		II
(a)	Dominance	(i)	Many genes govern a single character
(b)	Codominance	(ii)	In a heterozygous organism only one allele expresses itself
(c)	Pleiotropy	(iii)	In a heterozygous organism both alleles express themselves fully
(d)	Polygenic inheritance	(iv)	A single gene influences many characters.

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