Which statement best describes a polygenic trait? (1 point)
• A polygenic trait is only controlled by one environmental factor.
• A polygenic trait is controlled by multiple genes and influenced by the environment.
• A polygenic trait is only controlled by multiple environmental factors.
• A polygenic trait is only controlled by one gene and influenced by the environment.
A polygenic trait is controlled by multiple genes and influenced by the environment.
The statement that best describes a polygenic trait is: "A polygenic trait is controlled by multiple genes and influenced by the environment."
To determine the correct statement that best describes a polygenic trait, we can break down the options and analyze them one by one.
1. A polygenic trait is only controlled by one environmental factor.
This statement is incorrect because a polygenic trait is not solely determined by one environmental factor. While the environment can have an influence on polygenic traits, they are primarily controlled by multiple genes.
2. A polygenic trait is controlled by multiple genes and influenced by the environment.
This statement is correct. Polygenic traits are determined by the interaction of multiple genes. Each gene contributes a small effect to the overall phenotype of the trait. Additionally, the environment can also play a role in influencing the expression of these genes, leading to variations in the trait.
3. A polygenic trait is only controlled by multiple environmental factors.
This statement is incorrect as a polygenic trait is primarily controlled by multiple genes rather than multiple environmental factors. Environmental factors can have an influence, but they are not the primary determinant of polygenic traits.
4. A polygenic trait is only controlled by one gene and influenced by the environment.
This statement is incorrect because polygenic traits are not controlled by a single gene. They are controlled by multiple genes and can also be influenced by the environment.
Therefore, the correct statement that best describes a polygenic trait is:
• A polygenic trait is controlled by multiple genes and influenced by the environment.