Final answer:
The interaction between genes and the environment can be understood through range of reaction, genetic environmental correlation, effects of environment on phenotype, and epigenetics.
Step-by-step explanation:
The four main ways genes and the environment interact are through: range of reaction, genetic environmental correlation, environmental influences on phenotype, and epigenetics. The range of reaction concept asserts that genes set potential limits while the environment influences the realization of this potential. Genetic environmental correlation occurs when our genes influence the environments we are exposed to, and vice versa. Environmental factors like sunlight and nutrition can directly influence phenotypic expression of genes. Lastly, epigenetics studies how the same genotype can result in different phenotypes due to environmental factors altering gene expression without changing the underlying DNA sequence.