BIOLOGY 1M03 Chapter 15: Chapter 15- Human Genetic Diveresity
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Wide variation among humans language, fashions, customs, religion, technology, architecture, and other aspects of behavior differ among societies. Peoples of the world vary in blood type and the incidence of many genetically transmitted diseases scientists distinguish two sources of human variation: genetic and environmental. Genetic variation: differences between individuals that are caused by genes they inherited from their parents. Environmental variation: differences between individuals caused by environmental fa(cid:272)tors (cid:894)i. e. (cid:272)li(cid:373)ate, ha(cid:271)itat, a(cid:374)d (cid:272)o(cid:373)peti(cid:374)g spe(cid:272)ies(cid:895) o(cid:374) the orga(cid:374)is(cid:373)s" phe(cid:374)ot(cid:455)pes. for humans, culture is an important source of environmental variation. Difficult to determine relative importance of genetic and environmental influences for particular phenotypic traits. Genetic variation is governed by processes of organic evolution: mutation, drift, recombination, and selection. Variation within groups: differences between individuals within a given group of people. Variation among groups: differences between entire groups of people. Variation in traits influenced by single genes can be certain that variation arises from genetic differences between individuals.