Gauglerlecture4

Gauglerlecture4 - 1) Lect. 4-19 a) New species arise from...

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1) Lect. 4-19 a) New species arise from reproductive isolation, gene flow becomes interrupted b) Allopatric speciation i) Gene flow is inhibited because migration is inhibited. ii) “Geographical barriers” can be a cause iii) mountain ranges separate two species that were once one species and tailed apart. iv) Mutations cause one population to change, and become a new separate species. v) If the barrier is eventually removed, the two new species will NOT be able to interbreed successfully. vi) All in all reproductive isolation brings about speciation c) Sympatric speciation i) THIS DOES NOT INVOLVE A BARRIER. ii) Ecological barriers cause the speciation. iii) Species fill in the small ‘Niches’ that form in nature. iv) ECOLOGICAL ISOLATION v) Non-random mating separated animals that began to favor the new niche. vi) POLYPLOIDY IS ANOTHER WAY. vii)Organisms develop double chromosome numbers in one generation.
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This note was uploaded on 04/02/2008 for the course BIO 101 taught by Professor Martin during the Spring '08 term at Rutgers.

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Gauglerlecture4 - 1) Lect. 4-19 a) New species arise from...

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