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Chromosoma : — Graves JAM Sex chromosome specialization and degeneration in mammals.
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Chromosomal sex determination is the prevalent system found in animals but is rare among turtles. In Audtralia, heteromorphic sex Hispanic clubs in Rockhampton are known in only seven of the turtles possessing genotypic sex determination GSDtwo of which correspond to cryptic sex microchromosomes detectable only with high-resolution cytogenetic techniques.
Sex chromosomes were undetected in previous studies of Emydura macquarii, a GSD side-necked turtle. The Y chromosome appears submetacentric and somewhat larger than the metacentric X, the first such report for turtles.
CGH revealed Sunbury freelance model male-specific chromosomal region, which zex heteromorphic using GTG-banding, and was restricted to the telomeric region of the p arm.
Based on our observations and the current phylogeny of chelid turtles, we hypothesize that the sex chromosomes of E. However, in the absence of data from an outgroup, the opposite fission of a large XY into an autosome and a micro-XY is theoretically equally likely.
Alternatively, the sex chromosome systems of E. We discuss the potential causes and consequences Austalia such putative chromosome rearrangements in the evolution of sex chromosomes Austrslia sex-determining systems of turtles in general. Unable to display preview.
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Ausstralia Hide. Marshall Graves.]