ANT202H5 Lecture Notes - Lecture 13: Sickle Cell Trait, World Health Organization, Plasmodium

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24 Nov 2016
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Cultural practices and technology: main adaptive strategy, too successful = detrimental global environmental change. Biological responses: acclimatization, developmental adjustment, genetic adaptation inherited genetic changes. Acclimatization: physiological adjustment of individual organisms to different conditions. Vs. acclimation = changes occurring in response artificial/controlled situation. High altitude = increased respiration and heart rate, red blood cells produced. Increased uv radiation = tanning: immediate 1-2 hours of exposure, fades during first 24 hours, delayed 2-3 days of exposure, can last several months. Anatomical or physiological changes occurring during growth or development: result of environmental stresses, irreversible or difficult to reverse. Plasticity = ability of organisms to respond physiologically or developmentally to environmental stresses. Inadequate childhood nutrition: redced body dize of adlts. Good childhood nutrition: increase adult height. Migration to high altitude at early age: greater chest dimensions and lung capacity. Genetic changes that develop in populations over long perods of time. Increase overall fitness of population: environmental factors is malaria.

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