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Copyright 2004 by the Genetics Society of America DOI: 10.1534/genetics.104.029900

Summary: Copyright 2004 by the Genetics Society of America
DOI: 10.1534/genetics.104.029900
Shared Forces of Sex Chromosome Evolution in Haploid-Mating
and Diploid-Mating Organisms: Microbotryum violaceum and
Other Model Organisms
Michael E. Hood,*,1
Janis Antonovics* and Britt Koskella
*Department of Biology, University of Virginia, Charlottesville, Virginia 22903 and

Department of Biology, Indiana University, Bloomington, Indiana 47405
Manuscript received August 12, 2003
Accepted for publication May 24, 2004
It is usually posited that the most important factors contributing to sex chromosome evolution in diploids
are the suppression of meiotic recombination and the asymmetry that results from one chromosome (the
Y) being permanently heterozygous and the other (the X) being homozygous in half of the individuals
involved in mating. To distinguish between the roles of these two factors, it would be valuable to compare
sex chromosomes in diploid-mating organisms and organisms where mating compatibility is determined
in the haploid stage. In this latter group, no such asymmetry occurs because the sex chromosomes are
equally heterozygous. Here we show in the fungus Microbotryum violaceum that the chromosomes carrying the


Source: Antonovics, Janis - Department of Biology, University of Virginia


Collections: Biology and Medicine