Final answer:
An evolved trait does not definitively indicate a behavior is a human universal or has a genetic basis due to the complex interplay between genetic determinants and cultural influences. Evolutionary psychology guides predictions but empirical research is necessary to confirm genetic and adaptive aspects of human behaviors.
Step-by-step explanation:
The concept that a trait evolved does not necessarily imply that it is a human universal, nor does it serve as definitive evidence that a behavior has a genetic basis. While evolutionary psychology suggests that certain behaviors and psychological traits may have evolved to solve recurrent problems in human ancestral environments, proving that these are indeed genetic and not solely cultural remains challenging. Environmental factors and cultural pressures significantly influence behavioral expressions, which complicates the interpretation of these behaviors as being strictly adaptive in modern contexts.
Furthermore, understanding that behaviors could have been adaptive in historical contexts and not necessarily under current conditions adds another layer of complexity. This point emphasizes the importance of considering both contemporary and ancestral environments when assessing the adaptiveness of particular behaviors. Ultimately, although evolutionary theory can guide predictions regarding human behaviors such as mate choice, friendship, and social organization, careful empirical research is necessary to confirm the genetic determinants and adaptive nature of these characteristics.