Evolutionary Biology

How does the mode of evolutionary divergence affect reproductive isolation?

10.24072/pcjournal.226 - Peer Community Journal, Volume 3 (2023), article no. e6.

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When divergent populations interbreed, the outcome will be affected by the genomic and phenotypic differences that they have accumulated. In this way, the mode of evolutionary divergence between populations may have predictable consequences for the fitness of their hybrids, and so for the progress of speciation. To investigate these connections, we present a new analysis of hybridization under Fisher's geometric model, making few assumptions about the allelic effects that differentiate the hybridizing populations. Results show that the strength and form of postzygotic reproductive isolation (RI) depend on just two properties of the evolutionary changes, which we call the "total amount" and "net effect" of change, and whose difference quantifies the similarity of the changes at different loci, or their tendency to act in the same phenotypic direction. It follows from our results that identical patterns of RI can arise in different ways, since different evolutionary histories can lead to the same total amount and net effect of change. Nevertheless, we show how these estimable quantities do contain some information about the history of divergence, and that — thanks to Haldane's Sieve — the dominance and additive effects contain complementary information.

Published online:
DOI: 10.24072/pcjournal.226
De Sanctis, Bianca 1, 2; Schneemann, Hilde 1; Welch, John J. 1

1 Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
2 Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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De Sanctis, Bianca; Schneemann, Hilde; Welch, John J. How does the mode of evolutionary divergence affect reproductive isolation?. Peer Community Journal, Volume 3 (2023), article  no. e6. doi : 10.24072/pcjournal.226. https://peercommunityjournal.org/articles/10.24072/pcjournal.226/

Peer reviewed and recommended by PCI : 10.24072/pci.evolbiol.100543

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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