Testing the hypothesis
Testing the hypothesis
This chapter discusses methodologies to test the hypothesis of genetic exchange. The goal is to indicate the diversity of approaches that facilitate such tests. It begins by examining conflicting conclusions, drawn by different investigators, concerning the importance of gene flow in the genus Quercus. This is used to indicate the importance of utilizing a comparative approach when investigating possible instances of genetic exchange. Five methodologies to test for such exchange are discussed: (i) trans-generational hybrid zone analyses; (ii) estimates of phylogenetic discordance; (iii) analyses involving gene genealogies and models of speciation; (iv) estimations of intragenomic divergence; and (v) the application of nested clade analysis. Examples that highlight the specific utility of each of these approaches are reviewed.
Keywords: genetic exchange, trans-generational hybrid zone analyses, phylogenetic discordance, intragenomic divergence, nested clade analysis
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