The classic understanding of a widow's peak hairline as a simple dominant genetic trait is being challenged by evolutionary biologists. Current research suggests that the hairline's shape is not a direct genetic expression but rather a consequence of facial geometry, specifically the interaction of developmental zones that suppress hair growth on the forehead. This new model aligns with observations that individuals with wider-set eyes are more likely to exhibit a widow's peak, and it is considered a genuine morphogenetic clue in certain developmental syndromes. AI
RANK_REASON The item discusses a scientific paper and proposes a new explanation for a biological trait, fitting the research bucket. [lever_c_demoted from research: ic=1 ai=0.1]
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