BIOA01H3 Lecture 6: Evidence for Evolution – Part 2

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

Primate evolutionary tree: humans shared a common ancestor with chimpanzees about 5 million years ago, humans have 23 pairs of chromosomes (46 total chromosomes, chimpanzees have 24 pairs of chromosomes (48 pairs of chromosomes) There was a split between the ancestor of humans and the ancestor of the chimpanzee: there was a fusion of chromosome 2a and chromosome 2b. If life originated on earth in the distant past and then evolved, we should see evidence in the fossil record: the first detectable forms of life should be simple, complex forms will appear later. Cyanobacteria: first appeared on earth 3. 4 billion years ago, produced most of the oxygen. Conservation of bone structure homology: these are all very different in their morphology. Tiktaalik: is an organism that shows the evolutionary relationship between fish and amphibians: has amphibian-features with fish-like scales. Retrodictions: something that makes sense only in evolution, but is not predicted only by evolution.