The concept that genotypes are not the only things that control traits involves the fact that

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The concept of gene-environment interaction dictates that while genotypes play a role in determining traits, the environment can also influence the expression of those traits. This means that a single genotype can potentially result in a variety of phenotypes, depending on the environmental factors present. Dizygotic twins, even though they are not genetically identical, can still have similar phenotypic traits due to sharing the same environment. Recessive and dominant genes refer to the probability of a trait being expressed, not necessarily indicating the influence of the environment. The statement "the environment has little impact on behaviour" is false - the environment can have a significant impact on behaviour.

The Concept That Genotypes Are Not the Only Things That