Bio. 152 Week 2 Note
Bio. 152 Week 2 Note Bio 152
Virginia Commonwealth University
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This 2 page Class Notes was uploaded by Vania Notetaker on Monday September 12, 2016. The Class Notes belongs to Bio 152 at Virginia Commonwealth University taught by Alaina Campbell in Fall 2016. Since its upload, it has received 77 views. For similar materials see Introduction to Biological Science II in Biology at Virginia Commonwealth University.
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Date Created: 09/12/16
Week 2 Notes Key points//Terms// People Mutation in itself is not important but paired with other evolutionary mechanisms is important Genetic drift- random changes in an allele freq. that’s usually happing in generations over time. Molecular clock- time scale for how a species is created Chapter 22 Species & Speciation Species - Ability to pass on your genes - Closed gene pool - Biological Species Concept (BSC) most common used def.: Species are groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups Reproductive Isolation Pre—zygotic- prevent fertilization - Behavioral (Mating dance, bird singing) - Gametic isolation ( - Physical/mechanical incompatibly, lock and key - Time (temporal) and Space (ecological) Post- zygotic – prevent development into a fertile individual - Genetic incompatibility Problem with BSC - Hard to test - Morphospecies concept- members of the same species will look alike, with similar DNA - Cannot apply to asexual organisms - Cannot apply to extinct organisms - Ring species - Hybridizations Ecological Species Concepts (ESC)- ecological niche (ex. Bacteria & nutritional requirements) *Phylogenetic species concept (Evolutionary concept)(PSC)- members share a common ancestry - Apply to asexual species Speciation- the development of reproductively isolated populations resulting from the genetic divergence of separated populations **Partially reproductively isolated** Speciation from geographical separation *Most speciation *Subspecies 2 Processes for allopatric speciation - Dispersal; mainland population moves to an island population (Peripartric speciation) island pop. Has faster genetic divergence due to genetic drift & natural selection, adaptation to their new environment - Vicariance; change in the geography to spared a species **Research Darwin’s finches
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