Sexually Antagonistic Zygotic Drive: A New Form of Genetic Conflict between the Sex Chromosomes
- 1Department of Evolutionary Biology, Uppsala University, 752 36 Uppsala, Sweden
- 2IFM Biology, Linköping University, 581 83 Linköping, Sweden
- 3Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93111
- Correspondence: urban.friberg{at}liu.se
Abstract
Sisters and brothers are completely unrelated with respect to the sex chromosomes they inherit from their heterogametic parent. This has the potential to result in a previously unappreciated form of genetic conflict between the sex chromosomes, called sexually antagonistic zygotic drive (SA-ZD). SA-ZD can arise whenever brothers and sisters compete over limited resources or there is brother–sister mating coupled with inbreeding depression. Although theory predicts that SA-ZD should be common and influence important evolutionary processes, there is little empirical evidence for its existence. Here we discuss the current understanding of SA-ZD, why it would be expected to elude empirical detection when present, and how it relates to other forms of genetic conflict.
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