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Certain phenotypes in human population a...

Certain phenotypes in human population are spread over a gradient and reflect the contribution of more than two genes. Mention the term used for the type of inheritance? Describe it with the help of an example in human population.

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Polygenic inheritance
• If we assume skin colour is controlled by three genes A, B, C
• Dominant forms (A,B,C) are reSQPonsible for dark skin colour and recessive form (a, b, c) for light skin colour
• The genotype with all dominant alleles (AABBCC) will be darkest skin colour and with recessive alleles will be light test skin colour (aabbcc)
• The genotypes (AaBbCc) will be of intermediate skin colour i.e. with three dominant alleles and three recessive alleles
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