ANTH 101 Lecture Notes - Lecture 6: Vasodilation, Heart Rate, Sickle-Cell Disease
3 Oct 2016
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Genetic drift: sudden reduction in population size, changes allele frequency. Changes in allele frequency due to differential survival and reproduction (non random) Acts on the individual: ex: sickle cell anemia - aa (normal cell) as (sickle and normal cell) ss (sickled cell) Incidence of immunity against malaria - natural selection. Positive assortative mating - increases homozygosity: results in changes in genotype frequencies, but not allele frequencies, does not directly result in evolution but sets stage for natural selection. Homeostasis: maintenance of internal consistency within our bodies. Adaptation: long - term evolutionary changes that characterize all individuals within a population. Acclimatization: physiological response to changes in the environment that occur during an individual"s lifetime (temporary or permanent) Necessary nutrient in our body that fuels cell division. Uv radiation destroys folate in our bodies. Insufficient folate in pregnant women results in neural tube birth defects in babies. Darker skin (more melanin: protects skin from uv damage, beneficial in maintaining folate levels.
