Human Variation Microevolution

Human Variation - Human Variation Microevolution Tuesday 11:28 AM Important Points Lecture Topic During the lecture take notes here Insert a

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Lecture Topic: Polygenic trait, genetic component and environmental influence Skin Color Skin contains melanocytes that synthesize brown melanin pigment Differs on melanin not amount of melanocytes Blocks the effects of UV radiation, prevents and repairs damage from UV, absorbs UV and cause them to lose energy and neutralize the damage. Exposure to sunlight causes melanin production Skin Color is based on amount of Melanin Necessary for absorption of calcium, required to produce bones and teeth and Vitamin D is difficult to obtain in the diet Present in some fish Rickets may present from too little Vitamin D UV radiation of sunlight is necessary : Benefits Sunburn, damages DNA which leads to development of skin cancer 1 in 100,000 in dark skinned, 22 in 100,000 in light skinned Built up exposure Overexposure to UV radiation can be harmful Amount of melanin needed depends upon UV radiation Lots of melanin is needed to block effects of radiation
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This note was uploaded on 05/20/2010 for the course ANP 120 taught by Professor Koenig during the Spring '07 term at SUNY Stony Brook.

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Human Variation - Human Variation Microevolution Tuesday 11:28 AM Important Points Lecture Topic During the lecture take notes here Insert a

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