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(D) Polygenic inheritance is a type of inheritance in which a trait is controlled by two or more genes. In humans,skin colour is a classic example of

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Skin colour

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(D) Polygenic inheritance is a type of inheritance in which a trait is controlled by two or more genes. In humans,skin colour is a classic example of polygenic inheritance. It is influenced by the cumulative effect of multiple genes,resulting in a wide range of phenotypes rather than distinct categories. In contrast,colourblindness is an $X$-linked recessive trait,while phenylketonuria and sickle-cell anaemia are examples of monogenic (single-gene) disorders.

In human beings,multiple genes are involved in the inheritance of

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