ANTH 1001 : ANTH 1001 Exam 2
Document Summary
Lactase enzyme that allows you to digest lactose, which is a sugar in milk. Lactose intolerant deficiency in lactase symptoms: diarrhea, nausea, cramps and gas. Humans can digest milk as babies, but most of us lose the ability after weaning. Adults in some pops are lactose tolerant. Pops with long histories of dairying are typically lactose tolerant. Mutation for ability to digest milk as adults would have provided a natural selective advantage. Our species is polytypic phenotypically diverse pops in a species. Polytypism is result of diversity of environments that we inhabit. Our pops diversify b/c of natural selection, but our pops remain w/in a single species b/c of gene flow. Race not a biologically useful grouping of humans. Evolutionary perspective result of natural selection. Human variation perspective any beneficial modification that relieves environmental stress and enhances survival of individuals. Acclimatization as adaptation occurs at the level of the individual. Demonstrates the plasticity of human response to environmental stress.
