BIOL 522 Lecture Notes - Lecture 6: Ice Age, Introgression, Denisovan
Document Summary
More fluctuation in temperatures in interval between 12-100kya, used to be lots colder. Low temp -> lower precipitation, glaciers, lower sea levels. Lgm = drop in sea level, 23-14kya, land bridge allowed for possible migration, from eurasia to africa there"s 2 spots of land connection. Record temp over time by glaciers or rocks. Sahara used to be filled with trees https://www. sciencedaily. com/releases/2016/11/161130141053. htm. Amh expanded into middle east in 90-120kya via southern route, then northern route modern human behaviour appeared in africa after 100 kya. Single migration ooa 50-70kya, populations outside africa carried a shared subset of african genetic ancestry with minor neanderthal admixture. Rapid demographic growth -> menarche (menstruation for the first time), sedentarism/ malnutrition, infectious diseases (because they lived closer together) Hunter gatherers = nomadic, going over long distances sedentarism = inactive. Pastoralists fight agriculturalists, as the populations grow they fight for land. Studies based on mtdna and y dna left many questions unanswered, because there was gender bias.
