10 BISC_120 Speciation

10 BISC_120 Speciation - Reminders Blackboard Quiz #2...

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1 Reminders • Blackboard Quiz #2 begins this Friday, Sept 17 at noon • Please check your scores on Blackboard (Tools> My Grades) to be sure you are receiving your clicker points. Some clickers are still unregistered. 2 The following clicker IDs were used in class on Monday but were not yet registered • 9am: 2999A1 and 299FBF • 10am: 14B384, 303D50, 1F6787, 299FA6 and 27CD9F Speciation (24.1 - 24.2) 4 •Two basic patterns of speciation – Anagenesis (phyletic or vertical evolution) transforms one species into another –Cladogenesis (branching evolution) is the splitting of a gene pool, giving rise to one or more new species
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Anagenesis Cladogenesis 6 Darwin’s “Mystery of Mysteries” How do new species appear? 7 Species = fundamental unit of organization in nature • Ornithologist Ernst Mayr identified 137 birds in Papua New Guinea • Native Papuans already had names for 136 species 8 Species Concepts • Morphological : defines a species by structural features • Ecological : views a species in terms of its ecological niche • Phylogenetic : defines a species as the smallest group of individuals that share a common ancestor • Biological : actually or potentially capable of interbreeding
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9 Biological species concept is most popular, but does not work in all situations • Asexual taxa • Fossils • Taxa not amenable to breeding studies 10 No species concept works in all situations • Many species have few distinguishing
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This note was uploaded on 09/21/2010 for the course BIO 120 at USC.

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10 BISC_120 Speciation - Reminders Blackboard Quiz #2...

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