APchapter24notes - Chapter24Notes TheOriginofSpecies...

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Chapter 24 Notes The  Origin of Species
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The  Origin of Species There is more to evolution than just  explaining how adaptations evolve in a  population. Evolution must also explain  macroevolution : the origin of a new  taxonomic group Speciation : development of a new  species
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The  Origin of Species The fossil record displays two patterns of  speciation:  anagenesis  and  cladogenesis Anagenesis: the accumulation of changes  associated with the transformation of  one species into another Cladogenesis: the budding of new  species from a parent species that still  exists.
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The  Origin of Species
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Concept 24.1 Species : means “kind” or “appearance” - we distinguish plants and animals by  differences in appearance
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Concept 24.1 The biological species concept  emphasizes reproductive isolation - Ernst Mayr (1942) Biological species concept : defines a  species as a population whose  members have the potential to  interbreed in nature and produce viable,  fertile offspring.
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Concept 24.1
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APchapter24notes - Chapter24Notes TheOriginofSpecies...

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