Which genetic concept refers to the influence of genetic and environmental factors on phenotype expression?

The concept that refers to the influence of both genetic and environmental factors on phenotype expression is known as phenotypic variations. Phenotypic variation describes the observable differences in traits among individuals within a population, which arise due to a combination of genetic make-up (genotype) and environmental influences. This understanding is fundamental in genetics, as it explains why individuals with the same genetic information can exhibit different traits; environmental factors such as nutrition, climate, and exposure to toxins can significantly impact how these genetic traits are expressed.

Epigenetics is related but focuses specifically on changes in gene expression that do not involve alterations to the underlying DNA sequence, often influenced by environmental factors. Concordance rates refer to the frequency with which a particular trait appears in both individuals of a pair of twins and is more about the relationship between genetics and shared environments. Expressivity describes the degree to which a genotype is expressed in an individual's phenotype but does not inherently encompass the environmental influences on color or other traits. Overall, phenotypic variations is the most inclusive term for the combination of genetic and environmental factors affecting expression.