Question
Biology Question on Principles of Inheritance and Variation
Which one of the following is an example of polygenic inheritance?
Skin colour in humans
Flower colour in Mirabilis jalapa
Production of male honey bee
Pod shape in garden pea
Skin colour in humans
Solution
The correct answer is A:Skin colour in humans
Polygenic (or Quantitative) inheritance is that type of inheritance in which the complete expression of a trait is controlled by two or more genes in which a dominant allele of each gene contributes only a unit fraction of the trait and total phenotypic expression is the sum total of a additive or cumulative effect of all the dominant alleles of genes/polygenes. Human skin colour is an example of such polygenic inheritance which is controlled by three pairs of polygenes A, B and C. Negro/black colour is due to presence of all the six dominant contributing alleles AABBCC. Very light colour or white colour is due to presence of all six recessive non-contributing alleles aabbcc.