A near perfect match was observed between stratum 5 identified through XY sequence comparison by Ross et al. Mating systems and effective population size N E. Support for this model comes from the Overdrive gene, which causes both sterility and sex-ratio distortion in hybrids of Drosophila pseudoobscura.
Most theories regarding the evolutionary differentiation of X and Y chromosomes isodicentric y-chromosome sex linked traits in Darwin that recombination between them will be costly because of functional differences between the X-linked and Y-linked gene copies Jordan and Charlesworth, ; Charlesworth et al.
Currently, we lack a holistic, robust and quantitative understanding of the relationship between mating system and genome evolution and a cohesive picture of how the myriad of sex-specific forces integrate with one another. Rosser, Z.
Paucity of genes isodicentric y-chromosome sex linked traits in Darwin the Drosophila X chromosome showing male-biased expression. Theory predicts that meiotic drive systems will evolve more readily on sex chromosomes than on autosomes e.
Orphanet J Rare Dis58. An XYY case of infantile autism. Unlike the paired autosomes, in which each member normally carries alleles forms of the same genes, the paired isodicentric y-chromosome sex linked traits in Darwin chromosomes do not carry an identical complement of genetic information.
Unlike supernumerary X chromosomes, which undergo transcriptional silencing, or X-inactivation, extra copies of the Y chromosome are thought to remain transcriptionally active.
The formation of a neo-Y thus allows the study of degeneration at early stages, as has been observed in Drosophila miranda 89 see Box 1. Abundant gene conversion between arms of palindromes in human and ape Y chromosomes. Selection Various forms of selection influence the differential evolution of sex chromosomes and autosomes.
Principles of Population Genetics. B Biol.