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

In humans, we do not just have tall or short people as two distinct alternatives but a whole range of possible heights. Such traits are generally controlled by two or more genes and are thus called as polygenic traits. The inheritance of polygenic traits is called polygenic or quantitative inheritance.

In quantitative inheritance, the dominant alleles have a cumulate effect, with each dominant allele expressing a part of the functional polypeptide, and the full trait is shown when all the dominant alleles are present, genes involved in quantitative inheritance are called polygenes.

E.g. Kernel colour in wheat, skin colour in humans, height in humans.