Scientists have started to crack the 50-year-old puzzle of how temperature turns baby turtles male or female. Researchers show that cooler egg incubation temperatures turn up a key gene called Kdm6b in the turtle's immature sex organs. This in turn acts as a biological 'on' switch, activating other genes that allow testes to develop without altering the underlying genetic code. Continue Reading... Use this thread to discuss the article above. What are your thoughts about How turning down the heat makes a baby turtle male?