XO sex-determination system

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Notion

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Science and technology

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What Wikipedia says

The XO sex-determination system (sometimes referred to as X0 sex-determination system) is a system that some species of insects, arachnids, and mammals (not including humans) use to determine the sex of offspring.

Excerpt from the Wikipedia article “XO sex-determination system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Thomas Hunt Morgan, Public domain, via Wikimedia Commons.