Results 31 to 40 of about 1,541,356 (256)

Chromosome mapping of repetitive sequences in Anostomidae species: implications for genomic and sex chromosome evolution

Molecular Cytogenetics, 2012
Background Members of the Anostomidae family provide an interesting model system for the study of the influence of repetitive elements on genome composition, mainly because they possess numerous heterochromatic segments and a peculiar system of female ...
da Silva Edson Lourenço, de Borba Rafael Splendore, Parise-Maltempi Patrícia Pasquali   +2 more
doaj   +1 more source

Karyotype and male meiosis in Spartocera batatas and meiotic behaviour of multiple sex chromosomes in Coreidae (Heteroptera)

European Journal of Entomology, 2006
The Coreidae (Heteroptera) have holokinetic chromosomes and during male meiosis the autosomal bivalents segregate reductionally at anaphase I while the sex chromosomes do so equationally. The modal diploid chromosome number of the family is 2n = 21, with
María José FRANCO, María José BRESSA, Alba GRACIELA PAPESCHI   +2 more
doaj   +1 more source

Evolution of the canonical sex chromosomes of the guppy and its relatives [PDF]

, 2021
The sex chromosomes of the guppy, Poecilia reticulata, and its close relatives are of particular interest: they are much younger than the highly degenerate sex chromosomes of model systems such as humans and Drosophila melanogaster, and they carry many ...
Sardell, Jason M., Kirkpatrick, Mark, Pinto, Brendan J., Schartl, Manfred, Pinto, Brendan J, Dixon, Groves, Peichel, Catherine L, Sardell, Jason M   +7 more
core   +2 more sources

The inexorable spread of a newly arisen neo-Y chromosome [PDF]

, 2008
This work was financially supported by a Natural Environment Research Council grant to RAN. (NER-B-S-2003-00859) and a studentship from Queen Mary University of London to PV.A newly arisen Y-chromosome can become established in one part of a species ...
Keller, Irene, Irene Keller, Keller Irene, Veltsos, Paris, Nichols Richard A., Veltsos, P, Nichols, Richard A., Veltsos Paris, Richard A. Nichols, Nichols, R A, Richard A Nichols, Keller, I, Nichols, RA, Paris Veltsos   +13 more
core   +2 more sources

Sheltering of deleterious mutations explains the stepwise extension of recombination suppression on sex chromosomes and other supergenes

, 2022
International audienceMany organisms have sex chromosomes with large nonrecombining regions that have expanded stepwise, generating "evolutionary strata" of differentiation.
Giraud, Tatiana, Jay, Paul, Tezenas, Emilie, Véber, Amandine   +3 more
core   +1 more source

Temperature-dependent sex determination in fish revisited: Prevalence a single sex ratio response pattern, and possible effects of climate change. [PDF]

, 2008
Ospina-Álvarez N, Piferrer F (2008) Temperature-Dependent Sex Determination in Fish Revisited: Prevalence, a Single Sex Ratio Response Pattern, and Possible Effects of Climate Change. PLoS ONE 3(7): e2837.
Piferrer, Francesc, Natalia Ospina-Alvarez, Francesc Piferrer, Ospina-Álvarez Natalia, Piferrer Francesc, Piferrer, F., Ospina-Álvarez, Natalia, Ospina-Alvarez, N.   +7 more
core   +2 more sources

Diversity and complexity in neural organoids

FEBS Letters, EarlyView.
Neural organoid research aims to expand genetic diversity on one side and increase tissue complexity on the other. Chimeroids integrate multiple donor genomes within single organoids. Self‐organising multi‐identity organoids, exogenous cell seeding, or enforced assembly of region‐specific organoids contribute to tissue complexity.
Ilaria Chiaradia, Madeline A. Lancaster
wiley   +1 more source

Higher gene flow in sex-related chromosomes than in autosomes 2 during fungal divergence

, 2020
International audienceNonrecombining sex chromosomes are widely found to be more differentiated than autosomes among closely related species, due to smaller effective population size and/or to a disproportionally large-X effect in reproductive isolation.
Giraud, Tatiana, Rodriguez de La Vega, Ricardo, Hood, Michael, E, Gladieux, Pierre, Hartmann, Fanny, E, Ma, Wen-Juan   +5 more
core   +1 more source

The multicopy gene Sly represses the sex chromosomes in the male mouse germline after meiosis. [PDF]

, 2009
Studies of mice with Y chromosome long arm deficiencies suggest that the male-specific region (MSYq) encodes information required for sperm differentiation and postmeiotic sex chromatin repression (PSCR).
Yamauchi, Yasuhiro, Julie Cocquet, Nabeel A Affara, Burgoyne, Paul S., Yasuhiro Yamauchi, Cocquet, Julie, Affara, Nabeel A., Mahadevaiah, Shantha K., Ellis, Peter J.I., Peter J I Ellis, Monika A Ward, Shantha K Mahadevaiah, Ward, Monika A., Paul S Burgoyne   +13 more
core   +1 more source

Genetic and cytological analyses reveal the recombination landscape of a partially differentiated plant sex chromosome in kiwifruit

BMC Plant Biology, 2019
Background Angiosperm sex chromosomes, where present, are generally recently evolved. The key step in initiating the development of sex chromosomes from autosomes is the establishment of a sex-determining locus within a region of non-recombination.
S. M. Pilkington, J. Tahir, E. Hilario, S. E. Gardiner, D. Chagné, A. Catanach, J. McCallum, L. Jesson, L. G. Fraser, M. A. McNeilage, C. Deng, R. N. Crowhurst, P. M. Datson, Q. Zhang   +13 more
doaj   +1 more source