GenBio_4_Speciation

GenBio_4_Speciation - Speciation & Macroevolution...

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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 today 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 are based on their ability to produce viable offspring 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, 1942) Species Concept
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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 •Prezygot ic • Postzygotic due to behavioral isolation Prezygotic barriers
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5 Signals that facilitate species-specific recognition Auditory : crickets Chemical
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GenBio_4_Speciation - Speciation & Macroevolution...

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