Psychology 3228 Lecture Notes - Lecture 3: Zygosity, Coevolution, Parental Investment

• School: Western University
• Department: Psychology
• Course: Psychology 3228
• Professor: Scott Mac Dougall- Shackleton

Document Summary

Natural selection & sexual selection september 28, 2016. 2008 discovery of fossils in denisova cave, siberia. Last common ancestor with sapiens and neanderthals about 1 mya. Likely migrated out of africa between erectus and modern migrations. Substantial denisovan dna in melanesians, australian indigenous peoples and other se asia populations. Our understanding of human origins continues to evolve. Genetic analyses provide hither to unknown evidence for the dynamic patterns of gene flow as our ancestors spread around the globe. Evolutionary psychology posits we are adapted to ancestral conditions. Hunter gatherer from about 1,000,000 years ago to 8,000 years ago (or longer) Our species did not evolve in the current environment. Many currently nonadaptive behavior may reflect ancestral selection. We don"t know what the environment was exactly like, but we can make good estimates. Scarcity of some nutrients (iodine, some vitamins) Hunter gatherer (tribe of 60 or so per 400 square miles) Major city (6 million people in the same space)