This is where genetic effects
s attract environmental influences
on an organism
. The clearest occurrence of this in human
s is associated with gender
. Gender is determined purely by genetics, but gender determines how a person
is treated in society
s are raised differently to girl
s, they will be given different toy
s and they will wear different clothes
and so forth. Although there are differences in the psyche
of the male
, these are exacerbated by their roles in society
Other less obvious examples of gene-environment covariance include people with a genetic intolerance for alcohol. Such people will decline offers of drinks to avoid becoming ill. Also, children with a genetic tendency which promotes studiousness, will enjoy school and excel in an academic environment.
Such effects help to resolve the nature or nurture debate in developmental psychology. The evidence, as with so many things, points to some sort of middle-ground, with genetics and environment interacting closely rather than one predominating over the other.