Question

which statement best describes a polygenic trait? (1 point) a polygenic trait is only controlled by one environmental factor. a polygenic trait is only controlled by multiple environmental factors. a polygenic trait is controlled by multiple genes and influenced by the environment. a polygenic trait is only controlled by one gene and influenced by the environment.

Explanation:

To determine the correct description of a polygenic trait, we recall the definition: a polygenic trait is controlled by multiple genes (poly - many, genic - related to genes) and is also influenced by environmental factors. Let's analyze each option:

• Option 1: A polygenic trait is not only controlled by one environmental factor. Polygenic traits involve multiple genes, so this is incorrect.
• Option 2: A polygenic trait is not only controlled by multiple environmental factors. The key aspect of polygenic traits is the involvement of multiple genes, not just environmental factors, so this is incorrect.
• Option 3: This option correctly states that a polygenic trait is controlled by multiple genes and influenced by the environment.
• Option 4: A polygenic trait is not controlled by one gene. The term "polygenic" implies multiple genes, so this is incorrect.

Answer:

C. A polygenic trait is controlled by multiple genes and influenced by the environment.