Human Origins and Variation (GT
Human Origins and Variation (GT ANTH 120
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This 2 page Class Notes was uploaded by Justus Roberts on Tuesday September 22, 2015. The Class Notes belongs to ANTH 120 at Colorado State University taught by Kimberly Nichols in Fall. Since its upload, it has received 16 views. For similar materials see /class/210206/anth-120-colorado-state-university in anthropology, evolution, sphr at Colorado State University.
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Date Created: 09/22/15
Modern Human Variation Hypothesis for skin pigmentation High melanin production Selection favored dark skin in populations with high levels of UV radiation However there is no selective value for this theory Current folate hypothesis Currently held position dark skin protects against UV folate Destruction selection favored dark skin because individuals were protected from consequences from folate destruction Folate B vitamin obtained through diet necessary for dna synthesis red blood cell formation sperm production fetal development Spine bifida folate deficiency no protective tunnel around spinal cord membrane negatively impacts reproductive potential Low melanin production Under weakened UV radiation selection relaxed lower temperatures required better clothingshelters that further reduced UV exposure Vitamin D hypothesis selection favored light skin in low radiation environments in order to improve Vitamin D synthesis Rickets children with inadequate vitamin D Skin Cancer Biology vs Culture Humans engage in maladaptive behaviors Skin is the largest body organ average human has 21 square feet of skin UVA radiation has the longest wavelength and can penetrate to the bottom of the dermis UVA radiation can cause skin cancer UVB radiation has a medium wavelength and can only penetrate to the basal layer UVB cause skin cancer A cell becomes cancerous when a carcinogenic agent damages its dna The damage allows the cell to divide unchecked Skin cancer is the most common form of cancer in the US today Mortality risk depends on type and time of detection Basal Cell Carcinoma most common form of cancer in the US Squamosal Cell Carcinoma 2500 deaths a year in US second most common in US Malignant melanoma rarest and most lethal growing faster than 7 highest cancers in US Milk Digestion in Mammals Only useful for 30 of all modern humans today 5 of people have food allergies Lactose Intolerance not milk allergy 70 of people Lactose is milk sugar Undigested lactose enlarges in large intestines where it ferments creating intestinal distress Milk is for baby mammals Adult female mammary glands produce milk essential for newborn survival Nursing is particularly long in primate species Human and cow milk is 8588 water A newborn mammals produce actase Lactose cannot be digested without actase most mammals stop producing actase after weaning Lactase Persistence ancestor of populations with extensive catte pastoraism
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