Internal and external environmental factors, like gender and temperature, influence gene expression. Sex-limited traits are also autosomal. Unlike sex-influenced traits, whose expression differs ...

The observation that genetically identical organisms often vary greatly in phenotype clearly shows that gene-environment interaction is indeed an important regulator of phenotypic variation ...

In other words, genes are often related to environmental influences. This is called gene-environment correlation and has been observed in relation to the genetic factors underlying mental health ...