1. Karl Ernst von Baer zFirst rigorous generalization in comparative developmental biology

3. Karl Ernst von Baer zFirst rigorous generalization in comparative developmental biology yShowed that adults of more recently evolved species often differ markedly from adults of more primitive species yArgued that embryos of more recently evolved species often closely resemble the embryos of more primitive species

4. Charles Darwin - born in 1809

5. Charles Darwin 1831- 1836 Circumnavi- gated the globe aboard the H.M.S. Beagle

6. Charles Lyell zHighly influential geologist zIntroduced the notion of uniformitarianism zGave Darwin the gift of time

7. Thomas Malthus zIn 1798, he wrote An Essay on the Principle of Population

8. Charles Darwin 1838 Darwin’s notebooks mention natural selection

9. Charles Darwin 1844  Darwin drafts a manuscript laying out his ideas at length.  The manuscript remains unpublished until...

10. Alfred Russel Wallace 1858 Wallace sends Darwin a letter from Malaysia with idea of natural selection described

11. Charles Darwin 1859 Publishes The Origin of the Species that claims that natural selection causes adaptive evolutionary change

12. Gregor Mendel 1866 zUses pea genetics to show that genes behave like particles present as two copies yDarwin either failed to read Mendel’s paper or did not realize the significance of the paper

13. Ernst Haeckel Publishes on general morphology of organisms and states his biogenetic law: ontogeny recapitulates phylogeny

14. Correns, Tschermak and de Vries 1900 Rediscover Mendel’s laws