BIOLOGY 1M03 Chapter Notes - Chapter 11: Orrorin, Canine Tooth, Foramen Magnum
17 Sep 2013
School
Department
Course
Professor
Document Summary
Part 3: the history of the human lineage. Global cooling was associated with decreased rainfall and seasonally, including dry seasons. Tropical rainforests shrank in size; dry woodland and grassland habitat expanded. Ancestors of humans the hominins moved into the grassland habitat. Hominins classified with humans in the tribe hominini ; taxonomic unit between the family and the genus. Humans beong to the family hominidae includes all of the great apes and the genus homo. 5 human characteristics: bipedalism, differences in dental anatomy from other apes, very large brains relative to body size, long period of juvenile development, language. Dependence on a material and symbolic culture. Ancestral hominins shared some of the features of humans and some features of contemporary chimpanzees. Genetic data suggest that the most recent common ancestor (mrca) of chimps and humans lived about 5-7 mya. 3 fossils have illuminated what this ancestor was like; ardipithecus ramidus, orrorin tugenensis, and.
