The idea that a child of a professional athlete is exposed early to that sport, and that this environment then supports the child's inherited potential, illustrates:

1. Genetic environmental correlation holds that our genes influence our environment and our environment influences the expression of our genes. 2. The distinguishing feature is that the influence runs in both directions rather than one. 3. In the chapter's example, parents who share genes with the child also shape the environment the child grows up in, which in turn supports the child's genetic potential. 4. Range of reaction would describe only the environment determining where within fixed genetic limits the child lands, without genes shaping the environment itself. 5. Natural selection concerns differential survival and reproduction, and a polygenic trait is simply one controlled by more than one gene, so neither describes this loop. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 3 "Biopsychology", §3.1 Human Genetics_