Results 21 to 30 of about 4,675,098 (246)

Sex Determination, Sex Chromosomes, and Karyotype Evolution in Insects [PDF]

Journal of Heredity, 2016
Insects harbor a tremendous diversity of sex determining mechanisms both within and between groups. For example, in some orders such as Hymenoptera, all members are haplodiploid, whereas Diptera contain species with homomorphic as well as male and female heterogametic sex chromosome systems or paternal genome elimination.
Blackmon, Heath, Ross, Laura, Bachtrog, Doris   +2 more
openaire   +5 more sources

Digest [Elektronisk resurs] : Neo-sex chromosome underlying the Faster-Z effect in a species of Lepidoptera*

, 2022
Do Z chromosomes evolve at a faster rate than autosomes in Lepidoptera? Mongue et al. show that Z-linked genes in two Lepidopteran species evolve faster than autosomal genes. However, the neo-sex chromosome differs from the ancestral chromosome and shows
Yazdi, Homa Papoli,, Lund University.
core   +2 more sources

Evolution of fungal sex chromosomes

Molecular Microbiology, 2004
SummarySexual reproduction enables organisms to shuffle two parental genomes to produce recombinant progeny, and to purge the genome of deleterious mutations. Sex is conserved in virtually all organisms, from bacteria and fungi to plants and animals, and yet the mechanisms by which sexual identity are established share both conserved general features ...
Fraser, J. A., Heitman, J.
openaire   +5 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 ...
Beatriz Vicoso, J J Emerson, Yulia Zektser, Shivani Mahajan, Doris Bachtrog   +4 more
doaj   +1 more source

Heterochiasmy and Sex Chromosome Evolution in Silene

Genes, 2023
The evolution of a non-recombining sex-specific region is a key step in sex chromosome evolution. Suppression of recombination between the (proto-) X- and Y-chromosomes in male meiosis creates a non-recombining Y-linked region (NRY), while the X-chromosome continues to recombine in females.
openaire   +2 more sources

Cross-species chromosome painting tracks the independent origin of multiple sex chromosomes in two cofamiliar Erythrinidae fishes

BMC Evolutionary Biology, 2011
Background The Erythrinidae fish family is characterized by a large variation with respect to diploid chromosome numbers and sex-determining systems among its species, including two multiple X1X2Y sex systems in Hoplias malabaricus and Erythrinus ...
Trifonov Vladimir, Liehr Thomas, Kosyakova Nadezda, Marchal Juan A, Sánchez Antonio, Cioffi Marcelo B, Bertollo Luiz AC   +6 more
doaj   +1 more source

Sex Chromosome Degeneration by Regulatory Evolution [PDF]

Current Biology, 2020
In many species, the Y (or W) sex chromosome is degenerate. Current theory proposes that this degeneration follows the arrest of recombination and results from the accumulation of deleterious mutations due to selective interference-the inefficacy of natural selection on non-recombining genomic regions.
Lenormand, Thomas, Fyon, Frédéric, Sun, Eric, Roze, Denis   +3 more
openaire   +3 more sources

Recurrent neo-sex chromosome evolution in kiwifruit [PDF]

, 2023
Sex chromosome evolution is thought to be tightly associated with the acquisition and maintenance of sexual dimorphisms. Plant sex chromosomes have evolved independently in many lineages, and can provide a powerful comparative framework to study this. We
Fujita, Naoko, Ushijima, Koichiro, Henry, Isabelle M, Kuwada, Eriko, Catanach, Andrew, Beppu, Kenji, Shirasawa, Kenta, Varkonyi-Gasic, Erika, Akagi, Takashi, Allan, Andrew C, Kataoka, Ikuo, Masuda, Kanae, Datson, Paul, Mertten, Daniel, Charlesworth, Deborah, Daniel Mertten, Kenta Shirasawa, Isabelle M. Henry, Eriko Kuwada, Ikuo Kataoka, Andrew Catanach, Kanae Masuda, Erika Varkonyi-Gasic, Paul Datson, Naoko Fujita, Koichiro Ushijima, Andrew C. Allan, Deborah Charlesworth, Takashi Akagi, Kenji Beppu   +29 more
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Monotreme sex chromosomes – implications for the evolution of amniote sex chromosomes

Reproduction, Fertility and Development, 2009
In vertebrates, a highly conserved pathway of genetic events controls male and female development, to the extent that many genes involved in human sex determination are also involved in fish sex determination. Surprisingly, the master switch to this pathway, which intuitively could be considered the most critical step, is inconsistent between ...
Waters, Paul, Graves, Jennifer
openaire   +3 more sources

Is the Y chromosome disappearing?—Both sides of the argument [PDF]

, 2011
On August 31, 2011 at the 18th International Chromosome Conference in Manchester, Jenny Graves took on Jenn Hughes to debate the demise (or otherwise) of the mammalian Y chromosome.
Darren K. Griffin, Griffin, Darren K.
core   +1 more source