ANTHR101 Chapter Notes - Chapter 4: Light Skin, Sunburn, Dark Skin
5 Feb 2017
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There is genes that make for greater or lesser chances for survival and reproduction, but natural selection results in more favourable genes becoming more frequent in a population over time. Adaptations are genetic changes that give their carriers a better chance to survive and reproduce than individuals without the genetic change who live in the same environment. How adaptive a gene or trait is depends on the specific environment, what is adaptive in one environment may not be adaptive in another. Genetic adaptation: are changes within populations in response to selection pressure (over several generations); applies only to populations. Hu(cid:373)a(cid:374)s are i(cid:374)flue(cid:374)(cid:272)ed (cid:271)y their e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t through adaptatio(cid:374) a(cid:374)d a(cid:272)(cid:272)li(cid:373)atizatio(cid:374)"s. Acclimatization involves physiological adjustments to environmental conditions in individuals. Acclimatization may have underlying genetic factors, but they are not themselves genetic. They develop them during their lifetimes, rather than being born with them. Many a(cid:272)(cid:272)li(cid:373)atizatio(cid:374)"s are simple physiological changes in the body that appear and disappear as the environment changes.
