Biology 1001A Lecture Notes - Lecture 22: Species, Denisovan, Archaic Humans
24 Nov 2017
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Lecture 22 notes: competing theories about where modern humans (homo sapiens) evolved, and which is best supported by available evidence. A hypothesis proposing that modern humans first evolved in africa and then dispersed to other continents. A hypothesis proposing that after archaic humans migrated from africa to many regions on earth, their different populations evolved into modern humans simultaneously. Genetic data generally supported the african emergence hypothesis. Further work on the y-chromosomes of thousands of men from africa, Genomic analysis shows that our ancestors were mixed with neanderthals and. Denisovans: the biological species concept these three groups are not separate, but according to the phylogenetic species concept, there"s no clear connection, the morphological evidence is incomplete and doesn"t help either. The five skulls found show the same amount of variation that"s between a human and chimp. It makes us reconsider what we have the name homo: conditions necessary for reinforcement to occur.
