Homomorphic sex chromosomes

A problem complicating research in the group of species closely related to S. If you are following multiple publications then we will send you no more than one email per day or week based on your preferences. Molecular Biology and Evolution Loss of recombination between the sex chromosomes allows the proto-X and proto-Y or proto-Z and proto-W to evolve independently, and also sets the stage for the population processes causing degeneration of the nonrecombining sex chromosome 6. Recombination suppression is only one strategy for conflict resolution at loci undergoing opposite selection in males and females.
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C harlesworth , Evolutionary strata on the X chromosomes of the dioecious plant Silene latifolia: The pink vertical line that crosses panels B through F denotes the physical position of chromosome 1 where putative null alleles were detected on the Y chromosome. One marker B5 showed cosegregation mostly with the male sex, suggesting that the B5 marker is linked to the Y chromosome supplemental Table 5. Images from this publication. Can nuclear-cytoplasmic interactions select for maleness? Branch lengths correspond to total sequence divergence under the model assumed see bar.
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The maintenance of homomorphic, nonrecombining sex chromosomes could also result from rare recombination in sex-reversed ZY male or XY females, as has occurred in tree frogs 34 , but does not explain the lack of a restriction of recombination observed in ratites. Dot plot between Anolis chromosome 2 and the chicken Z chromosome. Cloning is only adequate for genotyping few genes in few individuals. We also show how data on allele frequency differences between sexes can be used to estimate linkage disequilibrium between loci and the sex-determining locus. Both of these approaches have severe limitations for population genetics and phylogeographic analyses. Heterozygote excess is commonly depicted by negative F is values.
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Tree for orthologs of the gene SlX3. Support Center Support Center. The morphology of the rudiment of the gynoecium suggests that developmental arrest in S. View this article with LENS. Using conventional F-statistics to study unconventional sex-chromosome differentiation https: Supplementary Material Supporting Information: Gynodioecy in the genus Silene is connected with nucleo-cytoplasmic male sterility.
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