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Sex determination in reptiles temperature

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Some reptiles such as crocodilians and some turtles are known to display temperature-dependent sex determination TSD , where the ambient temperature of the developing eggs determines the individual's sex. The research has been published in Scientific Reports. Guillette Jr. In their research using American alligators, they found that a thermosensitive protein called TRPV4 is present within the developing alligator gonad inside the egg.
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Temperature Dependent Sex Determination in Reptiles

Sex determination in reptiles temperature
Sex determination in reptiles temperature
Sex determination in reptiles temperature
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Temperature-dependent sex determination - Wikipedia

Alex Quinn, a Ph. Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination GSD and temperature-dependent sex determination TSD. Species in the genotypic group, like mammals and birds, have sex chromosomes, which in reptiles come in two major types. Many species—such as several species of turtle and lizards, like the green iguana—have X and Y sex chromosomes again, like mammals , with females being "homogametic," that is, having two identical X chromosomes. Males, on the other hand, are "heterogametic," with one X chromosome and one Y chromosome.
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Temperature-dependent sex determination

In most animals the sex of an individual is determined at the moment of fertilization; when the egg and the sperm fuse together it is fixed if that animal will be male or female. Yet in many reptilian groups sex determination is established later during incubation, and the determinant external factor is the incubation temperature of the eggs. In reptiles, this means that the environment plays a crucial role in determining the sex ratio emerging from an egg clutch, and that these animals are very susceptible to alterations in temperature caused, for example, by climate change.
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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.
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