ANT202H5 Lecture Notes - Lecture 7: Sickle Cell Trait, Red Blood Cell, Lactose Intolerance

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20 Aug 2017
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Human adaptation and changing environment: 4 ways humans respond to environmental stresses, cultural practises & technology. Too successful = detrimental global environmental change: biological responses: Acclimatization: physiological adjustment of individual organisms to different conditions. Reversible, no genetic change: vs. acclimatization = change occurring in response artificial/controlled situation. Examples of acclimatization: hot temperatures = increased sweating, high-altitude = increased respiration & heart rate, red blood cell production. Immediate (1-2 hours of exposure: fades during first 24 hrs. Delayed tanning (2-3 days of exposure: can last several months. Developmental adjustment: anatomical or physiological changes occurring during growth or development. Irreversible or difficult to reverse: plasticity = ability of organisms to respond physiologically or developmentally to environmental stresses. Reduced body size of adults: good childhood nutrition. Increased adult height: migration to high-altitude at early age, greater chest dimensions & lung capacity. Inheritable: genetic changes that develop in populations over long periods of time, result of natural selection.

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