Final answer:
Human traits are influenced by genes acting together, rather than being the result of a single gene. Many traits are polygenic, meaning they are controlled by multiple genes. Additionally, environmental factors can also influence the expression of these genes.
Step-by-step explanation:
Human traits are influenced by genes acting together and are not solely determined by a single gene. While some traits, such as eye color or cleft chin, may be controlled by a single gene, most traits are polygenic, meaning they are controlled by multiple genes working together. Additionally, the expression of these genes can be influenced by environmental factors.For example, the shape of earlobes is influenced by a single autosomal gene with two alleles - one for attached earlobes and one for free-hanging earlobes. Other polygenic traits include height, personality traits, and intelligence.It is important to note that some behaviors may have both genetic and environmental influences. However, the relative contributions of nature and nurture to human traits and behaviors is still a topic of debate.