GenBio4Speciation

GenBio4Speciation - Speciation & Macroevolution Species...

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1 Species Concept Reproductive Isolation Gradualism vs. Punctuated Equilibrium Macroevolution: Patterns in Evolution Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Coleoptera Family: Scarabaeidae Genus: Popillia Species: japonica Common name Japanese beetle What is a species? 1. Morphological Species Concept Mole Vole Species Concepts New species still described largely on this basis
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2 Limitations Polymorphism Species Concept Irreconcilable problems resulting from variation! 2. Biological Species Concept Species are populations that are reproductively isolated (Mayr, 1942) Species Concept Species Concept
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3 Limitations Relevant only for sexual organisms mitosis Species Concept: limitations Under artificial conditions, different species may interbreed X = Zebroid or Zorse Species Concept: limitations Species are populations that are reproductively isolated in nature and produce viable, fertile offspring (Mayr) Species Concept X = Zebroid or Zorse
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4 What prevents two species from producing fertile hybrids? Honey please, just calm down and let me explain…. Reproductive Isolation How does a species stay a species? Barriers to gene flow Prezygotic Postzygotic due to behavioral isolation Prezygotic Barriers Reproductive Isolation
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5 Signals that facilitate species-specific recognition Auditory : crickets Chemical : mosquito Reproductive Isolation Visual : firefly due to temporal isolation Reproductive Isolation brown trout rainbow trout due to mechanical isolation Reproductive Isolation anatomical incompatibility
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This note was uploaded on 10/08/2010 for the course BIO 380 taught by Professor Martin during the Spring '10 term at Rutgers.

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GenBio4Speciation - Speciation & Macroevolution Species...

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