Chapter 23 Species and Their Formation

Chapter 23 Species and Their Formation - Chapter 23 Species...

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Chapter 23 Species Recognition - Morphospecies concept o Classification of species based of appearance o Sexual dimorphisims may cause problems Species Form Over Time - speciation – process by which one species splits into 2 or more daughter species - reproductive isolation- makes distinct group reproduce with one another - biological species concept- group of actually or potentially interbreeding natural population that are reproductively isolated from other groups 23.2 New Species Arise - evolutionary change resulting in one species splitting into 2 or more daughter species - if sufficient genetic structures accumulate during isolation period, species may not be able to exchange genes when coming together again Allopatric Speciation -species divided by a physical barrier - prevents gene flow - prevention of gene flow depends on mobility and range of species Sympatric Speciation - speciation with out a physical barrier - started with disruptive selection - caused sometimes with polyploidly o caused by duplicate sets of chromosomes
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This note was uploaded on 09/15/2009 for the course BIOE 20c taught by Professor Marinovic during the Summer '09 term at University of California, Santa Cruz.

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Chapter 23 Species and Their Formation - Chapter 23 Species...

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