Final answer:
The components that contribute to phenotypic variance are genetic variance and environmental variance.
Step-by-step explanation:
The components that contribute to phenotypic variance are genetic variance and environmental variance.
Genetic variance: This component includes the diversity of alleles and genotypes within a population. It is influenced by the breeding of a species and the genetic structure of the population. Genetic variance can be attributed to genetic differences among individuals and is considered a heritable component of phenotypic variance.
Environmental variance: This component refers to the influence of the environment on phenotype. Environmental factors such as diet, temperature, and exposure to toxins can contribute to phenotypic variation among individuals in a population.
Genotype-Environment Interaction (VGE) - This is the portion of variance that results from the way in which different genotypes respond to varying environments.