Final answer:
Multifactorial characteristics result from the activity of polygenes influenced by environmental factors.
Step-by-step explanation:
Multifactorial characteristics result from the activity of polygenes influenced by environmental factors. Polygenic characteristics are controlled by more than one gene, and each gene may have two or more alleles. These genes may be on the same chromosome or on nonhomologous chromosomes. For example, skin color and adult height are polygenic characteristics in humans that are influenced by both genetic factors and environmental factors such as sun exposure.