10-ch14-species

10-ch14-species - Chapter 14 The Origin of Species The...

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Chapter 14 The Origin of Species
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(macro)evolution -- (1) all changes that have transformed life on earth from its beginnings to its current diversity, resulting from (2) any change in the genetic makeup of a population across generations Systematics (=taxonomy) -- branch of biology concerned with naming and classifying biological diversity - identify new species - establish relatedness among species - chronicle evolutionary history; “tree of life” The origin of species is the source of biological diversity
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Macroeveolution is observed at species and other higher levels Geographic or reproductive barrier different selection pressures lead to different adapations Phenotypic variation & genetic diversity occur both among species. Where do we draw the line between species?
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-- group (of organisms) whose members possess similar characteristics and have the ability to interbreed biological species concept -- population whose members have the potential to interbreed in nature and produce viable, fertile offspring, but cannot produce viable offspring with members of other populations morphological species concept -- defining species by measurable anatomical criteria ecological species concept -- defining species in terms of ecological roles (niches) Evolutionary species concept -- set of organisms with a share
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10-ch14-species - Chapter 14 The Origin of Species The...

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