Pleiotropy is a condition in which a single gene

controls only one phenotype

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controls more than one phenotype

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does not control any phenotype

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none of the above

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Solution

The correct option is C controls more than one phenotype
Pleiotropy occurs when one gene influences multiple, seemingly unrelated phenotypic traits, an example being phenylketonuria, which is a human disease that affects multiple systems but is caused by one gene defect.

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Similar questions

Column I	Column II
a. Dominance	1. In heterozygous condition both alleles express to create a mixed phenotype
b. Codominance	2. More than two alleles for a gene controlling a single character
c. Multiple allelism	3. Two alleles in a heterozygote create an intermediate phenotype
d. Incomplete dominance	4. In a heterozygous condition only one allele expresses itself

Usually a single gene controls a single phenotype. Sometimes one gene may influence more than one phenotypic trait. This phenomenon is known as __

	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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