BIOL 1115 Lecture Notes - Macroevolution, Polyploid, Multimodal Distribution

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Ex: cepaea snails vary because a wide geographic range causes selection to: maintenance of variations, genetic variability: distribution vary conditions. A species is an irreducible group of organisms diagnosably distinct from other such groupings and within which there is parental pattern of ancestry and descent: reproductive isolating mechanisms inhibit gene flow between species and maintain, reproductive isolating mechanisms: distinctiveness of species, prezygotic mechanisms: Adaptive radiation: when members of a species invade several new geographically separate environments (niches, the populations become adapted to the different environments, many new species evolve from the single ancestral species, example of allopatric speciation, sympatric speciation: Alloploidy: tetraploid hybridization in plants results in self fertile species reproductively isolated from either parental species i. e. prokaryotes, sharks, crocodiles and alligators, etc. ( living fossils : biodiversity: the scientific study of living organisms and how they have evolved, characteristics of living organisms, cells and organization:

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