Lampbrush chromosomes and chiasmata of sex-reversed crested newts

Chromosoma
H WallaceG M Badawy

Abstract

Triturus cristatus carnifex provides a particularly clear example of sexual dimorphism for chiasma frequency and localisation. Oocytes from normal XX females routinely carry one proximal chiasma on each arm of their lampbrush bivalents. Spermatocytes from normal XY males have more numerous and relatively distal chiasmata. Lampbrush chromosomes from the oocytes of sex-reversed XY neofemales are found to resemble those from normal oocytes in having one proximal chiasma on each bivalent arm. A comparison of particular markers on the heteromorphic long arm of chromosome 1 provides evidence to equate the lampbrush 1A to somatic 1A, and confirms previous reports that lampbrush chromosome 1A is slightly longer than 1B. The XY sex bivalent of neofemales does not show any obvious heteromorphy of recognised marker loops.

Citations

Nov 1, 2011·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Judith E Mank
Dec 7, 2006·Biology Letters·Steven FreedbergCraig E Nelson
Apr 23, 2008·Proceedings. Biological Sciences·Laura Berset-BrändliNicolas Perrin
Jun 2, 2011·PLoS Biology·Matthias StöckNicolas Perrin
Nov 15, 2012·The American Naturalist·Christine GrossenNicolas Perrin
Feb 3, 2018·Molecular Biology and Evolution·Nicolas RodriguesNicolas Perrin
Mar 14, 2003·Heredity·B M N Wallace, H Wallace
Sep 12, 2009·Evolution; International Journal of Organic Evolution·Nicolas Perrin
Oct 3, 2012·Evolution; International Journal of Organic Evolution·Christine GrossenNicolas Perrin
May 9, 2017·Evolution Letters·Ben WielstraJan W Arntzen
Apr 4, 2021·Genes·Wen-Juan Ma, Paris Veltsos

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