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Embryonic sex determination i. Many vertebrates, including mammals, birds, amphibians, and some reptiles exhibit genotypic sex determination GSD , where males or females are produced based on the sex chromosomes that an embryo receives from its parents. However, this familiar method for determining the sex of offspring is not the only process that has evolved in vertebrates. Many species of reptiles and fish rely on environmental factors to determine the sex of embryos.
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Temperature-Dependent Sex Determination in Reptiles

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How is the gender of some reptiles determined by temperature? - Scientific American

It is the most studied type of environmental sex determination ESD. Some other conditions, e. While TSD has been observed in many reptile and fish species, the genetic differences between sexes and molecular mechanisms of TSD have not been determined. The eggs are affected by the temperature at which they are incubated during the middle one-third of embryonic development. The thermosensitive, or temperature-sensitive, period TSP is the period during development when sex is irreversibly determined. It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. The extent of the TSP varies a little among species, [11] 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.
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Sex Determination in Reptiles

Skip navigation. 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. The production of sex hormones can result solely from genetics or from genetics in combination with the influence of environmental factors. Non-genetic sex determination occurs when the sex of an organism can be altered during a sensitive period of development due to external factors such as temperature, humidity, or social interactions. All crocodilians, most turtles , many fish , and some lizards exhibit TSD.
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NCBI Bookshelf. 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. In these reptiles, the temperature of the eggs during a certain period of development is the deciding factor in determining sex, and small changes in temperature can cause dramatic changes in the sex ratio Bull There is only a small range of temperatures that permits both males and females to hatch from the same brood of eggs. Figure
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