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Meiotic drive, postzygotic isolation, and the Snowball Effect
1Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045.
Biorxiv : the Preprint Server for Biology
|November 28, 2023
Summary
New research suggests that genes causing reproductive isolation in diverging populations may increase linearly, not exponentially, when driven by meiotic drive. This finding impacts our understanding of speciation and the snowball effect in evolutionary biology.
Area of Science:
- Evolutionary Biology
- Genetics
- Speciation
Background:
- Populations diverging accumulate genetic incompatibilities, reducing gene flow and driving speciation.
- Dobzhansky-Muller incompatibilities are key genetic factors in reproductive isolation.
- Existing models predict a rapid, quadratic increase (snowball effect) in these incompatibilities with genetic divergence.
Conclusions:
- Meiotic drive can significantly alter the expected rate of genetic incompatibility accumulation during speciation.
- The 'snowball effect' may not universally apply, particularly when meiotic drive is prevalent.
- Findings offer a refined perspective on the genetic architecture of reproductive isolation and speciation.
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