Results 1 to 10 of about 88,123 (163)
B chromosomes have a functional effect on female sex determination in Lake Victoria cichlid fishes. [PDF]
PLoS Genetics, 2011 The endemic cichlid fishes in Lake Victoria are a model system for speciation through adaptive radiation. Although the evolution of the sex-determination system may also play a role in speciation, little is known about the sex-determination system of ...
Kohta Yoshida +10 more
doaj +3 more sources
Genome assemblies of the liverwort Blasia pusilla uncover a well-defined pseudoautosomal region on homomorphic UV sex chromosomes [PDF]
Genome BiologyBackground Sex chromosomes evolve from autosomes and are expected to be initially homomorphic, though they may become heteromorphic over time. In diploid systems, one sex chromosome often degenerates, whereas homomorphy should persist longer in organisms
Yuling Yue +7 more
doaj +2 more sources
Sex, sex chromosomes and gene expression [PDF]
BMC Biology, 2011 The X chromosome has fewer testis-specific genes than autosomes in many species. This bias is commonly attributed to X inactivation in spermatogenesis but a recent paper in BMC Biology provides evidence against X inactivation in Drosophila and proposes ...
Wu Chung-I, Lu Xuemei
doaj +3 more sources
Sex-biased expression of sex-linked transcripts in spiny frogs with homomorphic sex chromosomes [PDF]
BMC GenomicsBackground The accumulation of sexually antagonistic mutations on chromosomes has been favored in driving the evolution of sex chromosomes. However, empirical evidence has been limited to species with heteromorphic sex chromosomes, where the patterns of ...
Yu Xiao, Yun Xia, Xiaomao Zeng
doaj +2 more sources
Numerous transitions of sex chromosomes in Diptera.
PLoS Biology, 2015 Many species groups, including mammals and many insects, determine sex using heteromorphic sex chromosomes. Diptera flies, which include the model Drosophila melanogaster, generally have XY sex chromosomes and a conserved karyotype consisting of six ...
Beatriz Vicoso, Doris Bachtrog
doaj +2 more sources
Ever-young sex chromosomes in European tree frogs.
PLoS Biology, 2011 Non-recombining sex chromosomes are expected to undergo evolutionary decay, ending up genetically degenerated, as has happened in birds and mammals. Why are then sex chromosomes so often homomorphic in cold-blooded vertebrates?
Matthias Stöck +13 more
doaj +3 more sources
Robertsonian fusion triggers recombination suppression on sex chromosomes in Coleonyx geckos
Scientific Reports, 2023 The classical hypothesis proposes that the lack of recombination on sex chromosomes arises due to selection for linkage between a sex-determining locus and sexually antagonistic loci, primarily facilitated by inversions.
Artem Lisachov +10 more
doaj +1 more source
Cells, 2023 Geckos are an excellent group to study the evolution of sex determination, as they possess a remarkable variability ranging from a complete absence of sex chromosomes to highly differentiated sex chromosomes.
Eleonora Pensabene +3 more
doaj +1 more source
Sex Chromosome Evolution in Muscid Flies
G3: Genes, Genomes, Genetics, 2020 Sex chromosomes and sex determining genes can evolve fast, with the sex-linked chromosomes often differing between closely related species. Population genetics theory has been developed and tested to explain the rapid evolution of sex chromosomes and sex
Richard P. Meisel +5 more
doaj +1 more source
Frontiers in Ecology and Evolution, 2022 Heteropteran insects exhibit a remarkable diversity of meiotic processes, including coexistence of different chromosomes types with different behavior during the first meiotic division, non-chiasmatic segregation, and inverted meiosis.
María Ayelen Toscani +3 more
doaj +1 more source