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A key expectation within evolutionary psychology is that if a behavior is genetically determined, it should be expressed across all human cultures. This assumption is based on the scientific understanding that the genetic differences among various human groups are minimal.

Cross-Cultural Expression of Genetic Behaviors

A researcher observes that a specific, complex fear response to a particular stimulus is present in individuals across every human culture they study, with no exceptions. Based on the principle that behaviors with a strong genetic basis are expected to be universal, what is the most logical inference about this fear response?

A team of psychologists travels to several geographically isolated communities around the world and finds that the facial expression for disgust is remarkably similar across all of them, especially in response to the smell of decaying food. From the perspective that certain behaviors are shaped by our genetic inheritance, what is the most likely conclusion the researchers would draw from this observation?

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