Explanation: Gene-environment correlations occus when an individual's genotype determine their exposure to extrinsic or environmental conditions.
However, when two traits (e.g weight and height) correlates in an individual, it results to a simultaneous change in the both.
There are three types of Gene-environment correlations in individuals. They include passive gene-environment (caused by union between genotype inherited by a baby from his or her parents and the environment), active gene-environment (which happens when an individual possesses a heritable inclination to determine its exposure to the environment), and evocative gene-environment (which occurs when an individual's (heritable) behavior initiate a response to the environment).
