Final answer:
A single trait can be controlled by multiple genes. Most traits are polygenic in nature, meaning they are influenced by the interaction of multiple genes.
Step-by-step explanation:
The statement that is true about genes and traits is: A single trait can be controlled by multiple genes.
Most traits are not controlled by a single gene, but instead, they are polygenic traits, which means they are controlled by multiple genes. Examples of polygenic traits in humans include height, skin color, and weight. These traits are influenced by the interaction of multiple genes.
For instance, eye color in humans is determined by over eight genes, each with their own alleles. The combination of these alleles determines the individual's eye color.