Final answer:
Multi-factorial traits are influenced by genes and the environment. Genes play a role in determining an organism's characteristics, but the expression of these genes can be influenced by environmental factors.
Step-by-step explanation:
Multi-factorial traits are influenced by genes and environment. Genes play a role in determining an organism's characteristics, but the expression of these genes can be influenced by environmental factors.
For example, sun exposure can affect the color of a person's skin, and temperature can determine the sex of some reptiles.