As populations diverge, they accumulate incompatibilities which reduce gene flow and facilitate the formation of new species. Simple models suggest that the genes that cause Dobzhansky-Muller incompatibilities should accumulate at least as fast as the square of the number of substitutions between taxa, the so-called snowball effect. We show, however, that in the special- but possibly common- case in which hybrid sterility is due primarily to cryptic meiotic (gametic) drive, the number of genes that cause postzygotic isolation may increase nearly linearly with the number of substitutions between species.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10680770 | PMC |
| http://dx.doi.org/10.1101/2023.11.14.567107 | DOI Listing |
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A history of studies of reproductive isolation between and .
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View Article and Find Full Text PDFThe evolution of a placenta accelerates the evolution of post-copulatory reproductive isolation.
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Department of Evolution, Ecology and Organismal Biology, University of California, Riverside, CA, United States.
The evolution of placentation is predicted to intensify intergenomic conflicts between mothers and offspring over optimal levels of maternal investment by providing offspring opportunities to manipulate mothers into allocating more resources. Parent-offspring conflicts can result in the evolution of reproductive isolation among populations when conflicts resolve in different ways. Postzygotic reproductive isolation is hypothesized to evolve more rapidly following the evolution of placentation due to the predicted increase in conflict.
View Article and Find Full Text PDFThe Curious Case of Eulimnogammarus cyaneus (Dybowsky, 1874): Reproductive Biology of a Widespread Endemic Littoral Amphipod From Lake Baikal.
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Centre for Neural Circuits and Behaviour, Department of Physiology, Anatomy and Genetics, University of Oxford, Mansfield Road, Oxford OX1-3SR, UK.
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Sci Rep
November 2024
Department of Life Sciences, Imperial College London, London, UK.
Article Synopsis
- Isolation mechanisms in the Anopheles gambiae complex, important malaria vectors, include both pre-zygotic barriers reducing gene flow and post-zygotic issues like sterility in hybrid males and decreased fertility in hybrid females.
- Genetic studies have revealed that hybrid incompatibility is largely influenced by interactions on the X chromosome, while also noting differences in the fertility of hybrid males based on the direction of the cross.
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