Slider turtle sex organ

The phenomenon was first discovered in reptiles more than 50 years ago, but until now the molecular details were a mystery. For a common pond and pet turtle called the red-eared slider, for example, eggs incubated at 32 degrees Celsius nearly 88 Fahrenheit produce all female hatchlings, while those kept at 26 degrees Celsius 79 Fahrenheit hatch as males. They found several genes that were turned up or down at one temperature but not the other. But one of the first genes to shift was one called Kdm6b, which became much more active at the cooler incubation temperatures that produce males, and was almost silent at warmer, female-producing temperatures.
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Animal Sex: How Sea Turtles Do It

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How to Tell If a Turtle Is Male or Female: 8 Steps (with Pictures)

Pet owners may be understandably alarmed to find a black, dark gray or purple organ protruding from the underside of their turtle's tail, but this sack-like black material is usually nothing to be worried about. It is, in fact, the reproductive organ of a male turtle, which is normally hidden within the cloaca until it's ready to be employed. If you see this organ coming from your turtle, you can feel confident about his gender. Turtles have a more complex reproductive system than may be evident at first glance, especially in the case of male turtles. Most of the time, the male turtle's reproductive organ remains tucked into the cloaca, a vent under the tail that serves as access to reproductive organs in both sexes, as well as an outlet for waste products. This organ in the male is quite extensive, relative to the turtle's body size; in some cases it can reach a length of half of the turtle's plastron.
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What is the Black Sack That Came Out of My Turtle's Tail?

Of the many unlikeable and inaccurate stereotypes maintained about animals in popular consciousness, among the most frustrating is what I term "old man turtle". This is the idea that turtles by which I mean, all members of Testudines are like decrepit, weak, bony little old men housed inside a box. It's not fair, and it's not at all accurate.
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If you keep pet turtles, it's nice to know if you've got boys or girls. However, unlike many mammals, turtles have no external genitalia. This makes determining their sex much more difficult, but it's not impossible. The differences between male and female turtles can be subtle and are easier to spot if you have one turtle of each sex so that you can compare.
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