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How Are Mendelian Inheritance, Polygenic Inheritance and Pleiotropy Different from Each Other? - Biology

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How are Mendelian inheritance, polygenic inheritance and pleiotropy different from each other?

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Solution

Mendelian inheritance refers to the expression of monogenic traits, i.e. gene expression is controlled by one gene. In a pair of alleles, an expression of the recessive gene is always masked by the expression of a dominant gene. The ability of a gene to have multiple phenotypic effects because it influences several characters simultaneously is called pleiotropy. It is due to the effect of the gene on two or more inter-related metabolic pathways which contributes to the formation of different phenotypes.

Polygenic inheritance is a type of inheritance controlled by one or more genes in which the dominant alleles have a cumulative effect with each dominant allele expressing a part or unit of the trait, the full being shown only when all the dominant alleles are present.

Concept: Elementary Idea of Polygenic Inheritance
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