ANTH 18630 Lecture Notes - Lecture 4: Tryptophan, Histidine, Valine

• School: Kent State University
• Department: Anthropology
• Course: ANTH 18630
• Professor: Linda B Spurlock

Document Summary

Human evolution | chapter 4 and protein synthesis. A reproductive population is a called a deme: deme: members of a species that produce offspring, gene pool: all the genetic information in the breeding population. Species are defined on the basis of their reproductive isolation. There are several mechanisms that keep different species from interbreeding. Little diffe(cid:396)e(cid:374)(cid:272)es i(cid:374) ea(cid:272)h g(cid:396)oup sta(cid:396)t to a(cid:272)(cid:272)u(cid:373)ulate o(cid:374)(cid:272)e the(cid:455)(cid:859)(cid:396)e physically isolated from each other: changes in behavior, changes in the shape of the genitalia, changes in odors, pheromones. Changes in allele frequency that occur from one generation to the next. Macroevolution is large-scale evolution such as a speciation event, that occurs after hundreds or thousands of generations. Speciation: cladogenesis: a new species splitting off; thought to be common. Extinction: the loss off a species due to the disappearance of its members, extinction is a common fate.