The results, which found evidence of TSD in four out of five species, confirmed that some vertebrate species exhibit TSD. For example, in many turtle species, eggs from cooler nests hatch as all males, and eggs from warmer nests hatch as all females.
There is only a small range of temperatures that permits both males and females to hatch from the same brood of eggs. High levels of aromatase activity increase the production of female temperature dependent sex determination in turtles as pets in Gatesheadresulting in the development of female characteristics.
Science News. Their results suggest that the temperatures an organism experiences during development significantly affect its reproductive success.
Sign In See Subscription Options. What causes a sea turtle to be born male or female? This paradigm, though, has been recently challenged, with new evidence now emerging that there may indeed be both sex chromosomes and temperature involved in the sex determination of some reptile species.
Get smart. For example, in many turtle species, eggs from cooler nests hatch as all males, and eggs from warmer nests hatch as all females. However, the sex of most turtlesalligators, and crocodiles is determined after fertilization. Sign up for our email newsletter.
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. Researchers have also noted that the warmer the sand, the higher the ratio of female temperature dependent sex determination in turtles as pets in Gateshead.
This is called temperature-dependent sex determination, or TSD. Learn More. A widely held view is that temperature-dependent and genotypic sex determination are mutually exclusive, incompatible mechanisms—in other words, a reptile's sex is never under the influence of both sex chromosomes and environmental temperature.
However, the sex of most turtlesalligators, and crocodiles is determined after fertilization. What causes a sea turtle to be born male or female? Males, on the other hand, are "heterogametic," with one X chromosome and one Y chromosome.
Skip navigation. The extent of the TSP varies a little among species,  and development within the oviducts must be taken into account in species where the embryo is at a relatively late stage of development on egg laying e.
It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. Download as PDF Printable version.