Question

Skin colour in humans does not have distinct alternate forms but shows a whole range of possible variations in skin colour. Explain the pattern of inheritance of such a trait. What is this type of inheritance known as ? Provide another example of exhibiting such an inheritance pattern.

Answer 1

Skin colour is controlled by three genes; A,B,C dominant genes and a,b,c the recessive genes ; the effect of each type of allele is addictive ; more the dominant allele, darker the skin colour; more the recessive allele lighter the skin colour ; when three dominant alleles and three recessive alleles

are present in an individual the skin colour is intermediate 
- Polygenic inheritance
- Human Height /or any other correct example