Crocodile sex determination
Temperature dependent sex determination is commonly seen in turtles,crocodiles and alligators. This enzyme reacts very slowly at 25C but very quickly at 30C so females hatch out of eggs that are incubated at warmer temperatures.
Charles Darwin first provided a lucid explanation of how gender differences evolve nearly years ago. Yet, a disconnect remains between his theory of sexual selection and the mechanisms that underlie the development of males and females.
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Alex Quinn, a Ph. Sex-determining mechanisms in reptiles are broadly divided into two main categories:
Molecular Mechanisms of Sex Determination in Reptiles
It is the most popular and most studied type of environmental sex determination ESD.
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.
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Environmental Sex Determination - Developmental Biology - NCBI Bookshelf
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