BIO220H1 Lecture 12: Lecture 12 Human-Agricultural Coevolution
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Human infants depend on milk: lactase production normally declines in adulthood, exception: people of north european origin, decline in lactase lactose intolerance , wild type: lactose intolerance in adulthood. Lactase persistence: lactase production persists through adulthood, allowing digestion of milk. Evolution in european cattle farming cultures: observation: changes in lactase gene correlated with ability to digest lactose as, hypothesis: substitutions are causal variants, they were formed by natural selection adult. If substitutions in lactase gene cause lactase persistence, other human populations with lactase persistence would have same substitutions, or changes with similar consequences. Change vs. determinism: single events can be due to change alone or o deterministic processes. Independent lines of evidence can confirm deterministic explanations by rejecting chance. Independent evolution of same trait in different groups: groups can be population or species, allow more confident determination that selection is at work, appears to use same genes.