Pleiotropy is the term that refers to the situation in which a gene influences more than one trait. Its example is given by

Sickle cell anaemia

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Hemophilia

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Colour blindness

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Only (a) and (b)

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Solution

The correct option is A Sickle cell anaemia
Pleiotropy occurs when variation at a single gene locus affects multiple aspects of the phenotype. For persons with an HbS/ HBs genotypes, medical consequences include anaemia, damage to various internal organs including the spleen and heart, and a 'tower' or 'bossed skull'.

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Similar questions

Q. A gene that influences more than one phenotypic trait is called .

Q. Assertion :The phenomenon of a single gene influencing more than one character is called pleiotropism. Reason: The gene responsible for phenylketonuria affects a number of abnormal phenotypic traits.

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

Is it necessary that all mutations in genes will lead to abnormalities in child? Is there any difference between sickle cell anemia and beta- cell anemia?

Q. Match the following

	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

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