IB35ACS Study Guide

Western corn rootworm o genetic drift migration new

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Unformatted text preview: cid differences are entirely absent among African humans, abundant among nonAfricans (especially Europeans), and abundant in chimpanzee/human comparisons We suggest that adaptive evolution for sunresistant MC1R alleles ensued when humans first became hairless savannahdwellers. The level of neutral MC1R variation among African humans provides a lower bound for the time since this event we have been hairless savannahdwellers for at least 1 million years.” o SWEAT: Thermoregulation ▪ Apocrine and Eccrine sweat glands ▪ eccrine decreases as we grow older, apocrine makes us smelly o Dark skin: original condition for our species o Effects of UVR exposure: ▪ Damage to DNA, inhibition of photosynthesis and phytoplankton, damage to cell membranes, catalyzes pre- vitamin D synthesis ▪ Breaks down folate, slows production of DNA o Folate: required for cell division o Evolutionary advantage of dark skin: sunscreen, prevents breakdown of folate by UVR ▪ But slows the production of vitamin D ▪ Rickets ● In women and pelvis and childbirth (Obstetric Fistulas) o Why d...
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This document was uploaded on 03/11/2014 for the course IB 35AC at Berkeley.

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