Chapter17Sum07

Chapter17Sum07 - Sexual Selection another mode of natural...

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Sexual Selection – another mode of natural selection
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Macroevolution : creation of biological diversity though speciation Microevolution : generation to generation change in a population’s allele frequencies due to natural selection and genetic drift, gene flow and mutation
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Evidence of Evolution - Review Fossils Radiometric dating Biogeography Comparative morphology Patterns of development Biochemistry
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Homology FLYING Bat Pterosaur Bird SWIMMING and DIGGING Mole Whale Sea lion Shared ancestry
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Homology (continued) RUNNING GRASPING and SWINGING Horse Lion Human Orangutan Two-toed sloth
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Convergence in the wings of bird and dragonfly Bird Dragonfly Analogous structures: Different responses to same challenge - flying
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California Madagascar
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Vestigial structures Remnants of structures that served important functions in organism’s ancestors
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Early embryos of a mouse and a human 200 µm 1000 µm Forelimb bud Heart Arch 3 Arch 2 Arch 1 Head Heart Arm bud 1 2 3
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Protein comparisons from yeast, wheat and primate
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Mule: cross between a female horse and a male donkey. Is this a species?
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Biological species concept A population or group of populations whose members can interbreed and produce fertile offspring -Reproductive isolation
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Wolf-dog Dog (Husky) Dog (German Shepard) Coyote
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Wolf Coyote Dog Coydogs- when mated back to parent species, offspring are sterile Hybrids are fertile and successful; has happened in nature Wolf-dogs fertile and successful; usually artificially mated How many species???
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Prokaryotes and some eukaryotes are asexual-how do we define a “species”?
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If a group of organisms are extinct- we can’t know how they reproduced-how do we define a species?
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Wolf Coyote Dog How many species??? Common ancestor Morphologically – major differences in teeth, jaws, toes, skulls, hearing Genealogically – there are more differences between wolves and coyotes than wolves and dogs Ecologically – coyotes don’t live in packs the way wolves do
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Reproductive Barriers Pre-zygotic Temporal isolation Habitat isolation Behavioral isolation Mechanical isolation Gametic isolation
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This note was uploaded on 03/22/2009 for the course BIOL 101 taught by Professor Hogan during the Summer '08 term at UNC.

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Chapter17Sum07 - Sexual Selection another mode of natural...

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