Sex Determination in Reptiles
@article{Bull1980SexDI, title={Sex Determination in Reptiles}, author={James J. Bull}, journal={The Quarterly Review of Biology}, year={1980}, volume={55}, pages={3 - 21} }
Two factors in reptile sex determination have been studied: (1) the presence or absence of heteromorphic sex chromosomes, and (2) the influence of temperature. Recognizable sex chromosomes are common in snakes and lizards, but are apparently rare in turtles and absent in crocodilians and the tuatara. Temperature-dependent sex determination (TSD) is common in turtles and has been reported in two lizards and alligators; however, data on TSD are available for few non-turtle species. Present…Â
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Sex-determining mechanisms in squamate reptiles
- Biology
- 1994
The sex-determining mechanisms of squamate reptiles are poorly known, relative to the large number of species in the group; only 16% of these species have been karyotyped (Olmo, '861), and the effects of multi-temperature incubations have been examined in only a few species.
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Physiological investigations of TSD have clarified the roles of steroid hormones, various enzymes, and H-Y antigen in sexual differentiation, whereas molecular studies have identified several plausible candidates for sex-determining genes in species with TSD.
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It appears that sex determination can be viewed as genotypic and monogenic with some individuals sexually inverted by the action of temperature.
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Results indicate that E. multicarinata displays GSD, as is most common in vertebrates, although I cannot rule out the possibility that sex determination is somewhat thermally sensitive.
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- Biology
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The general background and recent advancements for TSD research in reptiles is discussed and factors triggering the intrinsic genetic cascade, which leads either to development of a testis or ovary are discussed.
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- Biology
- 1989
Analysis of the effects of size and phylogeny on patterns of co-variation in certain squamate life-history traits reveals that although many variables scale allometrically with body size, significant variation in clutch size and age at maturity remains at order, family and generic level.
OF BIOLOGY JUNE 1991 ENVIRONMENTAL SEX DETERMINATION IN REPTILES : ECOLOGY , EVOLUTION , AND EXPERIMENTAL DESIGN
- Biology
- 2017
Physiological investigations of TSD have clarified the roles of steroid hormones, various enzymes, and HY antigen in sexual differentiation, whereas molecular studies have identified several plausible candidates for sex-determining genes in species with TSD.
Are Reptiles Predisposed to Temperature- Dependent Sex Determination?
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It is suggested that reptiles are predisposed to evolving TSD from genotypic sex determination (GSD) by virtue of the uniquely variable thermal environment experienced by their embryos during the critical period in which sex is determined.
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- BiologyJournal of Biosciences
- 2008
It is reported that, in the lab, extreme incubation temperatures can override sex chromosomes in the development of gonadal sex, and should be surprised at the coexistence of both systems in a species.