Chapter 24

Chapter 24 - Chapter 24 The Origin of Species...

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Chapter 24 – The Origin of Species - Macroevolution: The origin of new taxonomic groups o Speciation: the origin of new species 1. Anagenesis ( phyletic evolution) Accumulation of heritable changes 2. cladopehesis ( branching of evolution) Budding of a new species from a parent…. - What is a species? o Biological species concept (Mayr): A population or group of populations whose members have the potential to interbreed and produce viable, fertile offspring(genetic exchange is possible and that is genetically isolated from other populations) - Reproductive Isolation ( isolation of gene pools) o Prezygotic barriers: Impede mating between species or hinder the fertilization of the ova Examples Habitat o Water snakes, vs. land snake Behavioral o Fireflies o Mate signaling Temporal o Salmon o Seasonal mating Mechanical o Flowers o Pollination anatomy Prevent copulation or pollination o Gemetic Grogs Egg coat receptors o Postzygotic barriers
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Chapter 24 - Chapter 24 The Origin of Species...

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