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Ch 24 - The Origin of Species (1 slide per page)-1

Autopolyploidy b allopolyploidy 61 cladogenesis via

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Unformatted text preview: as in allopatric speciation) A. Autopolyploidy B. Allopolyploidy 61 Cladogenesis via sympatric Speciation A. Autopolyploidy = 2 species from 1 species Figure 24.10.5 (Campbell et al 9th ed) Sympatric Speciation via polyploidy 62 A. Autopolyploidy Original form + = Diploid + diploid = diploid = Viable and fertile New form + = Tetraploid + tetraploid = tetraploid = Possibly viable and fertile Reproductively isolated + = Tetraploid + diploid = triploid = possibly viable but sterile 66 Sympatric Speciation Speciation of populations in the same area due to a biological factor causing reproductive isolation vs. geographic isolation in allopatric speciation B. Sexual selection Barrier = female preference (not genetic incompatibility as in polyploidy) If certain ♀♀ prefer a particular trait (e.g. color) this could lead to separation into 2 groups which do not have gene flow Figure 24.12 (Campbell et al 9th ed) 68 What to Skip Figure 24.10 (Inquiry) Allopolyploidy (Figure 24.11 & associated text) Section 24.4 Next Chapter Chapter 26 – Phylogeny and the Tree of Life...
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