Skin colour in man is an example for

🔑Key Points:

✏️Polygenic inheritance:
-It is a quantitative inheritance, where multiple independent genes have an additive or similar effect on a single quantitative trait.
-It is also known as multiple gene inheritance.
-Effects of polygenic inheritance in humans are different in skin and hair colour, height, eye colour, the risk for diseases and resistance, intelligence, etc.

🔴Additional Information:
-Multiple allelism is a condition where three or more alleles of a gene are present. 
-An allele is one of two or more, type of the same gene at the same place on a chromosome.
-Types of blood groups illustrate multiple allelism.
-Pleiotropism is the condition in which a single gene controls more than one phenotypic traits in the same organism.

✏️Sex-linked inheritance:
-It is related to special pair of chromosomes known as the sex chromosomes.
-They are of type X and Y.
-Thomas Hunt Morgan proposed the Sex-linked inheritance