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Sunderland MA: Sinauer Associates ; Search term Environmental Sex Determination Temperature-dependent sex determination in reptiles 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 Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination (GSD) and temperature-dependent sex. Temperature-dependent sex determination (TSD) had been observed in all reptilian groups as well as in both XX/XY and ZZ/ZW types of sex determination. Understanding the mechanisms that determine an individual's sex remains a primary challenge for evolutionary biology. Chromosome-based...the end of the story look at the video above ↑ ↑ ↑

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