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Genetics, Vol. 167, 2083-2095, August 2004, Copyright © 2004
doi:10.1534/genetics.103.021303
Sex-Specific Meiotic Drive and Selection at an Imprinted Locus
Francisco Úbeda1 and David Haig
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
1 Corresponding author: St John's College, Oxford University, Oxford, OX1 3JP, United Kingdom.
E-mail: francisco.ubeda{at}sjc.ox.ac.uk
We present a one-locus model that breaks two symmetries of Mendelian genetics. Whereas symmetry of transmission is breached by allowing sex-specific segregation distortion, symmetry of expression is breached by allowing genomic imprinting. Simple conditions for the existence of at least one polymorphic stable equilibrium are provided. In general, population mean fitness is not maximized at polymorphic equilibria. However, mean fitness at a polymorphic equilibrium with segregation distortion may be higher than mean fitness at the corresponding equilibrium with Mendelian segregation if one (or both) of the heterozygote classes has higher fitness than both homozygote classes. In this case, mean fitness is maximized by complete, but opposite, drive in the two sexes. We undertook an extensive numerical analysis of the parameter space, finding, for the first time in this class of models, parameter sets yielding two stable polymorphic equilibria. Multiple equilibria exist both with and without genomic imprinting, although they occurred in a greater proportion of parameter sets with genomic imprinting.
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