BIO152H5 Lecture 8: BIO152H5F – Lecture Note 8
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Jean-baptiste de lamarck: first to use the term evolution, organisms had an innate drive to become more complex, first to provide a casual mechanism: the inheritance of acquired characteristics, la(cid:373)arck"s e(cid:454)a(cid:373)ple. Giraffe"s lo(cid:374)g (cid:374)ecks e(cid:448)ol(cid:448)ed as the(cid:455) stretched their (cid:374)ecks duri(cid:374)g their lives and long necks were passed on to their offspring: however, we know now, acquired traits cannot be inherited. Initiated scientific study of evolution: galapagos islands. Darwin observed that, although all the finches shared a common ancestor, their beak sizes had evolved to suit their food. Descent with modification: living organisms change gradually from one form into another over time. Selection: a process in which certain individuals have certain heritable traits that enables them to survive and reproduce. If environment changes, natural selection may result in adaptation to these new conditions. Sometimes this may result in formation of a new species.
