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This Concept Map, created with IHMC CmapTools, has information related to: chapter 24, prezygotic barriers type of mechanical isolation- morphological differences, postzygotic barriers type of hybrid breakdown- some first generation hybrids are viable and fertile but when they mate with one another or with either parent species, offspring of the next generation are feeble or sterile., sympatric speciation- speciation takes place in geographically overlapping populations ignite explosion of adaptive radiation- the evoltution of many diversely adapted species from a common sancesotr upon introduction of various new enviromental opportunites, Speciation adaptions evolve through microevolution, species emphasize unity within palentological species concept- focuses on morphologically discrete species known only from fossil record, Speciation adaptions evolve through macroevolution, prezygotic barriers type of temporal isolation- species that breed different times of the day, season, years cannot mix their gametes, species emphasize unity within phylogenetic species concept- set of organisms wih a unique genetic history, morphological species concept- characterizes a species by its' body shape, size, and other structural features advantages applied to sexual and asexual organisms and can be useful even without informantion on the extent of gene flow, macroevolution occur as a result of heterochrony-an evolutionary change in the rate or timing of developmenatl events, species emphasize unity within ecological species concept- view species in terms of its' ecological niche (role in community), chromosomal changes, nonrandom mating that reduces gene flow example of allopolyploidy- various mechanisms can change a sterile hybrid into a fertile polyploid, heterochrony-an evolutionary change in the rate or timing of developmenatl events example is paedomorphosis- when a rate of reproductive devolpment accelerates compared to somatic develpoment, the sexually mature stage of a species may retain body features that were juevenile structures in an ancestrial species, sympatric speciation- speciation takes place in geographically overlapping populations mechanisms include chromosomal changes, nonrandom mating that reduces gene flow, Speciation evolve through Evolutionary Adaption, chromosomal changes, nonrandom mating that reduces gene flow example of autoploidy- individual that has more than two chromosome sets, all derived from a single species, morphological species concept- characterizes a species by its' body shape, size, and other structural features disadvantages defintion relies on subjective criteria, Speciation with geographic isolation allopatric- gene flow is interrupted when a population is divided into geographicallly isolated sub populations, prezygotic barriers type of gametic isolation- sperm of 1 species may not be able to fertilize the eggs of another species., adaptive radiation- the evoltution of many diversely adapted species from a common sancesotr upon introduction of various new enviromental opportunites tempo of speciation punctuated equlibrium- new species changes most as it buds from a parent species and then changes little for the rest of its existance