Identifying a causal mechanism for one allele doesn't automatically resolve which factors explain variation across populations—molecular and quantitative approaches address different questions.

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allele(as used in genetics and discussion of inherited variation): A version or variant of a gene—think of it as one of several possible instructions for the same trait, like how you might have the 'brown eyes' version or the 'blue eyes' version of an eye color gene.
causal mechanism(as used in metaphysics and philosophy of causation): The process or chain of cause-and-effect by which one thing makes another thing happen.
molecular approach(as used in scientific methodology): A method of studying something by looking at its tiniest physical parts—like examining the actual DNA or protein structures to understand how genes work at the smallest level.
quantitative approach(as used in scientific methodology): A method of studying something by measuring and comparing numbers and statistics—like counting how often a trait appears in different groups rather than looking at its molecular structure.

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Identifying a causal mechanism for one allele doesn't automatically resolve which factors explain *variation* across populations—molecular and quantitative approaches address different questions.