Haldane's rule

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Notion

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Science and technology

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What Wikipedia says

Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if—in a species hybrid—only one sex is inviable or sterile, that sex is more likely to be the heterogametic sex.

Excerpt from the Wikipedia article “Haldane's rule”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User:Dietzel65, User:RichardWeiss, CC0, via Wikimedia Commons.