We explore this idea by examining the molecular, cellular, morphological, and physiological changes that occur during gonadogenesis. Hormone Research. We used the same procedures for collecting and incubating eggs and administering hormones as described in Rhen and Lang . As described above, this is a well-established method of delivering hormones to embryos that develop inside eggs.
Modeling the Gene Regulatory Network for Sex Determination Functional characterization of individual genes is clearly one of the biggest challenges facing researchers that study reptiles.
Trends Genet. Gen Comp Endocrinol ;— Scand J Work Environ Health ;—7. Exogenous estrogens induce ovary development in embryos incubating at male-producing temperatures, while aromatase inhibition can induce testis development in embryos at female-producing temperatures. Conversely, there is evidence for genetic variation in thermal sensitivity in TSD species, including several turtles, American alligators, and the leopard gecko [ Bull et al.
Biol Rev Camb Phil Soc. Although the precise environmental effects of the great impact event of 65 million years ago MYA are open to debate, it is not contested that profound global environmental changes must have occurred 31—
Sex determination and differentiation. For that reason, we provide a prospectus on various techniques that promise to reveal new sex-determining genes and regulatory interactions among these genes. The final distinguishing feature of testis morphogenesis is formation of the male-specific vasculature [ Morrish and Sinclair, ].
Extended production of the Mullerian duct regressor in the American alligator. It is quite possible that there are other species of reptiles with more complicated scenarios of temperature reversal of chromosomal sex. Temperature-Dependent Sex Determination in Reptiles The sex of a reptile embryo partly results from the production of sex hormones during development, and one such process to produce those hormones depends on temperature of the embryo's environment.