The best example for pleiotropy is

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(C) Pleiotropy occurs when a single gene influences two or more seemingly unrelated phenotypic traits.Phenylketonuria $(PKU)$ is a classic example of

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Phenylketonuria

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(C) Pleiotropy occurs when a single gene influences two or more seemingly unrelated phenotypic traits.Phenylketonuria $(PKU)$ is a classic example of pleiotropy,where a mutation in the gene encoding the enzyme phenylalanine hydroxylase leads to multiple effects,including mental retardation,reduced hair pigmentation,and skin problems.$ABO$ blood group is an example of multiple allelism.Skin colour is an example of polygenic inheritance.Colour blindness is a sex-linked Mendelian disorder.

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The phenomenon of a single gene regulating several phenotypes is called

The colour of the flower in pea is always linked with

Find the correct statement.
$(1)$ Generally a gene regulates a trait,but sometimes one gene has an effect on multiple traits.
$(2)$ The trait $AB$-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.

$A$ pleiotropic gene is responsible for which of the following conditions?

The metabolic disorder Phenylketonuria is an example of which type of genetic effect?

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