[BIOL108] - Midterm Exam Guide - Everything you need to know! (22 pages long)

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Natural selection (cid:12254) (directional - favors 1 extreme, disruptive - favors 2 extremes, stabilizing - against extremes ) (cid:12254) (cid:12254) (cid:12254) Gene ow = high variation within a pop. , low variation between pops. Genetic drift = change in allele freq. due to chance. (founder e ect - pops move to an area, establishing new habitat) (bottleneck - few are eliminated due to undesirable event) Microevolution = evolution @ pop lvl (mainly through adaptation or drift) Macroevolution = evolution above species lvl (ie: extinctions, speciation - origin of new species) If not then they"re reproductively isolated and considered as separate species. Allopatric = 1 pop divided by geographical barrier. Sympatric = subgrps stop mating w/indivs of larger pop = 2 new reproductively isolated species. Asexual rep. ) (exchange rna via gene horizontal transfer, transformation, transduction, conjugation. ) (obtain nutrients - chemotrophs, phototrophs: autotrophs/heterotrophs) (unicellular) (cid:12254) Oxygen revolution (o2 began accumulating 2. 7bya, photosynthetic cyanobacteria used sun"s energy to split h20 & o2.