Biology 1001A Lecture Notes - Lecture 3: Lamarckism, Darwinism, Common Descent

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Beth Mac Dougall Shackleton Tom Haffie

Document Summary

Cycle 1 (lecture 3) why evolution is true. Major components of modern evolutionary theory: evolution, common ancestry, speciation, variational rather than transformational nature, gradualism, role of selection: evolution: Allele frequencies in a population change from one generation to the next. Populatio(cid:374)s are(cid:374)(cid:859)t fi(cid:454)ed o(cid:448)er ti(cid:373)e the(cid:455) (cid:272)ha(cid:374)ge o(cid:448)er ti(cid:373)e. Emergence of drug resistance in viruses = another example: common ancestry: All life is related through a common ancestor. Arrangement of bones in humans is exactly the same as the flipper of a dolphin. The reaso(cid:374) for this is that at o(cid:374)e poi(cid:374)t i(cid:374) ti(cid:373)e (cid:449)e all shared a (cid:858)(cid:272)o(cid:373)(cid:373)o(cid:374) a(cid:374)(cid:272)estor(cid:859) at that same arrangement of bones -> homology: speciation: (cid:862)the for(cid:373)atio(cid:374) of (cid:374)e(cid:449) a(cid:374)d disti(cid:374)(cid:272)t spe(cid:272)ies i(cid:374) the (cid:272)ourse of e(cid:448)olutio(cid:374)(cid:863) Darwinian evolution theory -> natural selection (cid:862)e(cid:448)olutio(cid:374) is (cid:374)ot tra(cid:374)sfor(cid:373)atio(cid:374)al(cid:863) ((cid:373)ea(cid:374)i(cid:374)g that e(cid:448)olutio(cid:374) does(cid:374)(cid:859)t o(cid:272)(cid:272)ur fro(cid:373) the development of an individual/ changing phenotype in an individual=> growing a neck longer to reach a tree)