Support Center Support Center. The distinction between chromosomal sex-determination systems and TSD is often blurred because the sex of some species — such as the three-lined skink Bassiana duperreyi and the central bearded dragon Pogona role of temperature in sex determination in reptiles n in South Shields — is determined by sex chromosomes, but this is over-ridden by temperatures that are tolerable but extreme.
An Introduction to Behavioral Endocrinology. It is quite possible that there are other species of reptiles with more complicated scenarios of temperature reversal of chromosomal sex. Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination GSD and temperature-dependent sex determination TSD.
Temperature-dependent sex determination in three reptile species: the American alligator Alligator mississippiensisthe red-eared slider turtle Trachemys scripta elegansand the alligator snapping turtle Macroclemys temminckii.
The distinction between chromosomal sex-determination systems and TSD is often blurred because the sex of some species — such as the three-lined skink Bassiana duperreyi and the central bearded dragon Pogona vitticeps — is determined by sex chromosomes, but this is over-ridden by temperatures that are tolerable but extreme.
This thermosensitive period occurs after the egg has been laid, so sex determination in these reptiles is at the mercy of the ambient conditions affecting egg clutches in nests. It is not known whether the temperature sensitivity resides in the aromatase gene or protein itself or in other proteins that regulate it.
Warner, Daniel, and Richard Shine. See Subscription Options.
Bibcode : PLoSO Temperature-dependent sex determination in three reptile species: the American alligator Alligator mississippiensisthe red-eared slider turtle Trachemys scripta elegansand the alligator snapping turtle Macroclemys temminckii. As mentioned in Chapter 3, the sex of the echiuroid worm Bonellia depends on where a larva settles.
Charnier observed that temperature affected sex ratios, which are the number of females versus males in a population or a single clutch of eggs, of the rainbow Agama lizard, Agama agama. Cite this Page Gilbert SF.
Already a subscriber? Please review our privacy policy. It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. While sex hormones have been observed to be influenced by temperature, thus potentially altering sexual phenotypes, specific genes in the gonadal differentiation pathway display temperature influenced expression.