The likely mechanism of inheritance for a character with a large range of phenotypes is polygenic inheritance.

Question

True or False?

Answer 1

If the range is continuous like height or weight with no discrete categories then this is due to polygenic inheritance.

If the range is not continuous eg blood groups  where the range is not continuous and there are discrete  categories (Group A, B, AB, O) then this is due to multiple alleles at one locus and not polygenic.

Answer  = true in some cases and false in others.

Answer 2

True.

The way you get a range of phenotypes is through quantitative genetic interactions with other genes and the environment.  For example, hair color.  There is a large range of colors and this trait is caused by the interactions of multiple genes.