EEB211_Lecture5_Speciation notes

EEB211_Lecture5_Speciation notes - Lecture 5 Speciation...

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Species (definition) see slides Asexual species – there can be no gene flow as they are reproductively isolated (can’t get close together) o Parts of definition don’t apply well to all species: In triploid species, the presence of 3 chromosomes cannot be divided evenly into 2, so they are forced to be asexual in meiosis. Ideal species is reproductively isolated from all other species. How much genetic difference is needed to get a good species? o Humans are 2% genetically different from chimpanzees o Define: Phylogeny [KO1] Sometimes, there is no morphological difference between two species. How does speciation [KO2] take place? (See textbook chapter to clarify this) It is possible for different selection pressures such as whether to change the appearance/genetic information of a given species such that is specializes into 2 different species. Note: that genetically different species which are similar to at least under 1% are considered subspecies rather than 2 different ones.
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  • Fall '11
  • JamesL.Gould
  • Evolution, different species, mechanical prezygotic isolation, genetically different species, wrong plant

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