What data allowed researchers to conclude that there was a significant gene-environment interaction affecting larval foraging behavior in fruit flies?

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The significant gene-environment interaction affecting larval foraging behavior in fruit flies was concluded based on the observation that in the absence of food, rover and sitter genotypes behaved similarly, while in the presence of food, they behaved differently. This indicates that the environment (presence or absence of food) interacts with the genetic makeup (rover or sitter genotype) to influence behavior.

What Data Allowed Researchers to Conclude That There Was a Significant