Hi!
The answer would be: One gene can influence one/a single trait(s). One trait can be determined by more than one/ many gene(s).
Genes are hereditary units that are responsible for imparting certain features to an organisms. One gene can influence only one particular trait, such as the gene for B-galactosidase is the lacZ. This gene only influences the production of the enzyme B-galactosidase, and no other features of the individual, and has other mutant alleles (variants of the gene) such as lacZAM15 and lacZ' .
A trait, however, can be determined by more than one genes and this form of inheritance is known as polygenic inheritance. Examples of the traits that are influenced by more than one genes is eye color, skin color and hair color, where each different gene have an additive effect on the phenotype.
Hope this helps!
