Modern Evolutionary Theory and Human Evolution James A. Van Slyke Modern Synthesis • Darwinian Evolution – Descent with modification from a common ancestor – Small changes gradually occur over time – Natural Selection – different traits promote survival or lead to extinction – Sexual Selection – traits that promote or diminish reproduction Modern Synthesis Modern Synthesis • Genetic Theory – Mechanism that transfers traits to offspring – Missing piece of Darwin’s Theory • Genotype – set of gene’s from individual DNA • Phenotype – Observed characteristics produced by a genotype Modern Synthesis • Genetic Variation – Mutations – changes in DNA sequence – Gene Flow – movement of genes between populations – Sex – introduce new gene combinations • Genetic Variation produces phenotypic variations • Phenotypes with adaptive value increase survival and reproduction • Adaptive value passed on through genotypes Human Evolution • Humans and chimpanzees share 98.5% of the same genes • Hominid lineage split from chimpanzee about 6 million years ago • Homo sapiens – 200,000 years ago from Africa • Many important transitions in human behavior and cognition Primate Evolutionary Tree Important transitions • Burial of the Dead – 95,000 years ago – Buried with beads and other symbolic objects – May have religious significance; belief in life after death – Burial site in Israel • 30 buried individuals found • 9 year old found with a pair of antlers Important Transitions • Use of pigments and coloring – 350,000 years ago – Marked persons and objects with color • Cave painting and Drawing – 32,000 years ago – Early forms of symbolic thought Important Transitions • Cave painting and Drawing – 32,000 years ago Important transitions • Figurines and carvings – May have religious significance for different rituals – Early forms of symbolic thought in combining animal with human forms – May also have sexual significance in carvings of the female form Lion-head figure Venus figure Important transitions • First religious temple – 11,000 years ago – Turkey – Rows of standing stones – Images of animals – “Gobekli Tepe” Important transitions • Çatalhöyük (http://www.catalhoyuk.com/) – 7500 BC – Feasts with animals – Burials of ancestors – Religion and daily life highly integrated – Religion could not be separated from other aspects of culture Çatalhöyük Çatalhöyük