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 ...
Doris Bachtrog, Beatriz Vicoso
exaly +3 more sources
Comparative Sex Chromosome Genomics in Snakes: Differentiation, Evolutionary Strata, and Lack of Global Dosage Compensation [PDF]
PLoS Biology, 2013 Snakes exhibit genetic sex determination, with female heterogametic sex chromosomes (ZZ males, ZW females). Extensive cytogenetic work has suggested that the level of sex chromosome heteromorphism varies among species, with Boidae having entirely ...
Doris Bachtrog +2 more
exaly +2 more sources
Sex-limited chromosomes and non-reproductive traits
BMC Biology, 2022 Sex chromosomes are typically viewed as having originated from a pair of autosomes, and differentiated as the sex-limited chromosome (e.g. Y) has degenerated by losing most genes through cessation of recombination.
Aivars Cīrulis +2 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
Genome assemblies of the liverwort Blasia pusilla uncover a well-defined pseudoautosomal region on homomorphic UV sex chromosomes. [PDF]
Genome BiolBackground 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
Yue Y +7 more
europepmc +2 more sources
A specific insertion of a solo-LTR characterizes the Y-chromosome of
BMC Research Notes, 2010 Background Relatively few species of flowering plants are dioecious and even fewer are known to have sex chromosomes. Current theory posits that homomorphic sex chromosomes, such as found in Bryonia dioica (Cucurbitaceae), offer insight into the early ...
Renner Susanne S +2 more
doaj +2 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 ...
Xiao Y, Xia Y, Zeng X.
europepmc +2 more sources
Sex Determination and Sex Chromosomes in Amphibia
Sexual Development, 2017 Sex chromosomes in most amphibians are homomorphic (undifferentiated) in both sexes and are characterized by frequent turnover. This is in sharp contrast to sex chromosomes in 2 major vertebrate groups, the mammals and birds, where they are heteromorphic in one sex and are highly conserved.
Ikuo Miura
openaire +3 more sources
Ever-young sex chromosomes in European tree frogs. [PDF]
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 +2 more sources
The Sex-Chromosomes of Sea-Urchins
Science, 1925 THE SEX-CHROMOSOMES OF SEA-URCHINS The Sex-Chromosomes of Sea-Urchins (61) (-
Wilson, Edmund B.
core +4 more sources