Chapter 10

CHROMOSOME INVERSIONS, ADAPTIVE CASSETTES AND THE EVOLUTION OF SPECIES’ RANGES

Mark Kirkpatrick

Mark Kirkpatrick

Department of Integrative Biology, University of Texas, Austin, TX, 78712 USA

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Brian Barrett

Brian Barrett

Department of Integrative Biology, University of Texas, Austin, TX, 78712 USA

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First published: 19 July 2016

Summary

A chromosome inversion can spread when it captures locally adapted alleles or when it is introduced into a species by hybridization with adapted alleles that were previously absent. We present a model that shows how both processes can cause a species range to expand. Introgression of an inversion that carries novel, locally adapted alleles is a particularly powerful mechanism for range expansion. The model supports the earlier proposal that introgression of an inversion triggered a large range expansion of a malaria mosquito. These results suggest a role for inversions as cassettes of genes that can accelerate adaptation by crossing species boundaries, rather than protecting genomes from introgression.

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