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Polygene Inheritance
The phenomenon of polygene inheritance helps explain why parents of average height can produce very tall or very short offspring
Height is controlled by 4 gene pairs and different combinations of the tallness or shortness alleles are reflected in differences in stature in much the same way as described for the inheritance of skin tone.
For an example, skin color is controlled by 3 separately inherited genes, each existing in 2 allelic forms: A, a; B, b; C, c. The A, B, and C alleles confer dark skin pigment and the other effects they have are additive. The a, b, and c alleles confer light skin pigment
Polygene Inheritance results in continuous or quantitatively phenotypic variation between 2 extremes and explains many human characteristics such as skin pigment, intelligence and height.
Polygene Inheritence occurs when several gene pairs interact to produce phenotypes that vary quantitatively over a broad range.
