When studying phenotypic variations due to the environment, it is necessary to compare organisms with identical genotypes. In addition, it is necessary to use identical environments when studying variation due to differing genotypes.

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This is because when studying phenotypic variations due to the environment, the focus is on the effect of the environment while controlling for genetic differences. Similarly, when studying variation due to differing genotypes, the focus is on the effect of genetics while controlling for environmental differences. Therefore, using identical genotypes in different environments or different genotypes in identical environments helps to isolate and study the specific effects of either the environment or genetics on phenotypic variation.

When Studying Phenotypic Variations Due to the Environment, It Is