ANTH 1001 : ANTRO Exam 2 Notes
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Lactase-enzyme that allows you to digest lactose, which is a sugar in milk. Symptoms: diarrhea, nausea, abdominal cramps, gas. Humans can digest milk as babies, but most of us lose the ability after weaning. Adults in some populations are lactose tolerant. Populations with long histories of dairying are typically lactose tolerant. Definition: polytypism-phenotypically different populations in a species. Polytypism is result of diversity of environments that we inhabit. Our populations diversify because of natural selection, but our populations remain within a single species because of gene flow. Race-not a biologically useful grouping of humans. Evolutionary perspective-any beneficial modification that relieves environmental stress and enhances survival of individuals. Types of adaptations: behavioral, short term (reversible) acclimatization, developmental (irreversible) acclimatization, genetic (result of natural selection) Melanin is produced melanocyte, which are in epidermis of skin. Melanin is packaged into granules called melanosomes. Melansomes are transferred to keratinocytes, which are also in epidermis.
