01:119:115 Lecture Notes - Speciation, Polyploid, Exaptation

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Limitations: polymorphism, one species can have different structures: they may be within the same species, but they have different structures, biological species concept: isolated in nature and produce fertile viable offspring species are populations that are reproductively. Visual firefly: temporal isolation, mechanical isolation: seasonal mating anatomical incompatibility, lock and key reproductive parts must fit together, puppy will try to reproduce with a rabbit, habitat isolation, gametic isolation: biochemical incompatibility, egg and sperm will not recognize each other. Gradualism vs. punctuated equilibrium: slow steady accumulated of genetic changes over time, theory of punctuated equilibrium: periods, after which they change abruptly in response to sudden changes in the environment species remain unchanged for long. Preadaptation: the origin of evolutionary novelties from pre existing structures: adaptive radiation: species in a short period of time many ecologically diverse species from on ancestral, extinction: now extinct. Darwin"s finches: migration, no gene flow, different mutations, genetic drift, environments different with unexploited niches.

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