Which of the following traits is controlled b | vedclass

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(A) Polygenic inheritance is a type of inheritance in which a single trait is controlled by two or more genes. $1.$ Skin color in humans is a classic

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Skin color

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(A) Polygenic inheritance is a type of inheritance in which a single trait is controlled by two or more genes. $1.$ Skin color in humans is a classic example of polygenic inheritance,where the phenotype is determined by the cumulative effect of multiple genes. $2.$ Phenylketonuria is a Mendelian disorder caused by a mutation in a single gene ($PAH$ gene). $3.$ Down's syndrome is a chromosomal disorder caused by the presence of an extra copy of chromosome $21$ (trisomy). $4.$ Color blindness is an $X$-linked recessive disorder caused by a mutation in a single gene located on the $X$ chromosome. Therefore,the correct option is $A$.

Which of the following traits is controlled by more than one gene?

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