Humber Admissions Practice Test

The concept that describes traits influenced by both genes and the environment is best represented by the notion of complex inheritance. Complex inheritance encompasses traits that are not solely determined by a single gene, but rather result from the interactive effects of multiple genes and environmental factors.

This understanding highlights that many characteristics in organisms are the result of intricate interactions, rather than straightforward genetic determinism. For example, traits such as height, weight, and susceptibility to certain diseases can be influenced by a combination of genetic predispositions as well as lifestyle, diet, and environmental conditions.

While polygenic inheritance refers to traits controlled by multiple genes, it does not inherently emphasize the environmental factors involved. Genotype refers specifically to an individual's genetic makeup, and phenotype describes the observable characteristics resulting from the genetic and environmental interplay. Complex inheritance captures the broader context of how both genetic and environmental elements contribute to the manifestation of traits.