bio102 lecture 1-18 - 1/18/08: Evolution Examples II: Human...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1/18/08: Evolution Examples II: Human Evolution (Ch. 16, p. 281-287) Some Facts Chimps not our ancestors per se - share common ape-like ancestor only 2% DNA difference (~5 MYA) Human evolution not a “ladder” Some hominid ancestors overlapped From the beginning: Primates evolved from insect-eating mammals ~65 MYA Important characteristics: dexterous hands claws-> nails sensitive fingers eyes close together – better depth perception eye-hand coordination The early humans (homonids) The key distinction between homonids and apes is bipedalism (upright walking) Australopithecus : until recently thought first bipedals walked African savanna Lucy – 3.2 MY old Extinct ~1.4 MYA But until recently- a gap between 4 and 12 million yrs. ago… Newly discovered fossils suggest even earlier origins of homonids Ardipithecus ~5.2 million yrs. Old Orrorin: ~6 million yrs. old Sahelanthropus: 7 million yrs. old Debates continue:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

bio102 lecture 1-18 - 1/18/08: Evolution Examples II: Human...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online