Archived from the original on There is only a small range of temperatures that permits both males and females to hatch from the same brood of eggs. Vertebrate Life. As ofsixty-five of seventy-nine tested species of turtles were found to exhibit TSD.
Other work centers on a theoretical model the Charnov — Bull model  predicted that selection should favour TSD over chromosome -based systems when "the developmental environment differentially influences male versus female fitness";  this theoretical model was empirically validated thirty years later  but the generality of this hypothesis in reptiles is questioned.
Hermaphrodite Intersex Disorders of sex development Sex reversal. Gilbert SF. The thermosensitive, or temperature-sensitive, period TSP is the period during development when sex is irreversibly determined. Zoological Science. Sexual Development. Recent Activity. New Jersey: Pearson Education,
While the sex of most snakes and most lizards is determined by sex chromosomes at the time of fertilization, the sex of most turtles and all species of crocodilians is determined by the environment after fertilization. If such a snail is removed from its attachment, it will become female.
It has been proposed  that temperature acts on genes coding for such steroidogenic enzymesand testing of homologous GSD pathways has provided a genic starting point. Bibcode : PLoSO This phase is followed by the degeneration of the male reproductive system and a period of lability.
They did so to test the predictions of the Charnov-Bull model. Fertility and Sterility. Namespaces Article Talk. The warming of the habitats of species exhibiting TSD are beginning to affect their behavior and may soon start affecting their physiology.
Bibcode : Natur.