Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Inheritance of human skin colour is an example of polygenic or quantitative inheritance. Dominant alleles contribute to dark skin, whereas recessive alleles contribute to light skin. An individual with all 6 dominant alleles (AABBCC) will have darkest skin, whereas an individual all 6 recessive alleles (aabbcc) will have lightest skin. In the given example, AaBbCc, AAbbCc and aabBCC each has 3 dominant alleles. AabbCc has only 2 dominant alleles; hence, its skin will be lighter than the rest.