Final answer:
Polygenic traits are physical traits controlled by multiple genes with multiple alleles, resulting in wide variation. Examples include height, skin colour, hair colour, and eye colour.
Step-by-step explanation:
Polygenic traits are physical traits that are a reflection of a variety of genes being expressed. These traits show wide variation and are controlled by multiple genes with multiple alleles. Examples of polygenic traits include height, skin colour, hair colour, and eye colour.