BIO 2137 Lecture Notes - Lecture 2: Paraphyly, Theodosius Dobzhansky, Overfishing
12 Jan 2018
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What is systematics: darwin, wilson i(cid:374)(cid:448)e(cid:374)ted the (cid:449)ord (cid:862)(cid:271)iodi(cid:448)ersity(cid:863, dobzhansky genetics, jesophola (big fly ?, gould systematics of dead things. 1. 75 million species known: possibly 30 to 50 million to find, life can be found every where! Systematics: definition: the science that names, classifies, and determines the evolutionary relationships of living organisms. Divides into 2 discipline: taxonomy: consists of identifying, naming and classifying species, phylogeny: evolutionary history of organisms, taxonomy and phylogeny go hand in hand. Why is it important: biology is a comparative science, and systematics provides the units (species, families. Etc) and the means (classification, phylogeny) by which valid comparisons can be made: systematics at the bottom, up to ecology, then anatomy, then. Oaks: not all oaks look the same! They vary by region: 150 species in mexico and 600 species world wide, pe(cid:374)(cid:374)y is(cid:374)"t a(cid:272)tually a (cid:373)aple!
