BIOA01H3 Lecture : evo lec 3.docx

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

Document Summary

Physically preserved organism from ancient rocks or amber. Used to see them change over time from old fossils. Had a wolf like skull, ear, pelvis bone, and structures to facilitate 4 legs. When people used to eat vegetables, they needed to chew harder, so there were molar teeth that helped that. When people used to eat vegetables, it took more digestion. Now, there"s less digestion required, so the intestines shrunk, and the appendix is the remaining piece that dangles down. Structures are similar; conclude that they are common, but diverged from a common ancestor. Show relationships of creatures based on their anatomical features. Suggests that they"ve come form a different branch, but evolved to have similar looks. Evolved to have similar colours, but not from same ancestor. Similarities in dna and amino sequences are molecular evidence of similarity and common ancestry.