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What if temperature determined a baby’s sex?

Would one sex be favored over another?

The sex of humans is largely controlled by the X and Y sex chromosomes. However, in many reptiles and fish, sex is instead influenced by how warm or cool eggs are before hatching. What might life be like for humans if sex was likewise under the sway of temperature?

The fact it was even possible to control the sex of animals using heat or cold was first uncovered in the rainbow agama lizard in 1966 by French zoologist Madeline Charnier at the University of Dakar in Senegal. She found hatchlings from eggs incubated at lower temperatures were female, while those that developed at higher temperatures were male.

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