BIO 1130 Lecture Notes - Lecture 6: Common Descent, Natural Selection, Pterosaur

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

First 2 were accepted right away by the public but the last 3 were not (cid:271)e(cid:272)ause they did(cid:374)"t k(cid:374)o(cid:449) the a(cid:271)out the prese(cid:374)(cid:272)e of the hereditary material: no constancy of species: Fossil record is incomplete in term of biodiversity of the planet. In the last 20-30 years most fossils were made available for us. Transition fossils were hard to find (ex. S23: finding this fossil was important, its an intermediate between a bird and a reptile. S24: fossil that was transformed into a seal: common ancestry: They"re the sa(cid:373)e stru(cid:272)ture, or share the sa(cid:373)e a(cid:374)(cid:272)estor, (cid:271)ut the bones have been adapted to perform drastically different functions. Embryology: embryos looked similar in the early stages, but as they grew the species grew differently. Vestigial structures: functional in other species but useless for others. Appendix is not a vestigial structure: it is the seat of bacteria, and it is very important in the immune system.