BIOL359 Study Guide - Final Guide: Introgression, Hybrid Zone, Sympatric Speciation
4 Apr 2017
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Type specimen: single individual that represents the entire species. Specimens considered to belong to same species if they agree morphologically with the type. Cryptic species: species that cant be distinguished on the basis of their morphological characteristics. Species: group on interbreeding natural pop that are reproductively isolated from other groups. Individuals within a species resemble each other due to gene flow results from interbreeding. Problems: asexual taxa doesn"t apply, fossil taxa cant be tested, hybridization is difficult to apply. Applies to natural pop difficult to test. Grizzly and polar bears are interspecific hybridization. Hybrid zones: geographic contact zone where interbreeding occurs and freq of hybrids is high. Hybrids can have lower fitness than parents: reinforcement and character displacement short lived hybrid zone. Reinforcement: assorative mating, results in evo of isolating mechanisms that prevent hybridization. Character displacement: disruptive selection that increases diff b/w two parental lineages.
