what do you mean by polygenic inheritence?
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Polygenic inheritence occur when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are skin colour ,height, eye colour and weight. Assume that three genes A, B, C control the skin colour in humans.
Dominant forms A, B and are responsible for dark colour and the recessive forms a, b, c for light colour of the skin.
Genotype with dominant alleles (AABBCC) will have darkest skin colour while genotype with recessive alleles (aabbcc) will have lightest skin colour.
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