Identical twins Ilyse and Lauren both have a gene for trait H. The gene for trait H is expressed only when a child eats rice before the age of 2. Ilyse and Lauren are separated at birth, and Ilyse lives in Japan, where babies begin eating rice at an early age. Lauren lives in Canada, and she is not given rice before the age of 2. Ilyse develops trait H, whereas Lauren does not develop the trait. This is an example of

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Genotype-environment interaction occurs when the expression of a gene is influenced by environmental factors. In this case, the gene for trait H is only expressed when a child eats rice before the age of 2. Ilyse and Lauren are identical twins, so they have the same genotype. However, they live in different environments, and this difference in environment leads to a difference in the expression of the gene for trait H.

Identical Twins Ilyse and Lauren Both Have a Gene for Trait