Relating to or showing heterosis, which is when offspring from parents of different genetic backgrounds are stronger or healthier than either parent alone.
From 'heterosis' (Greek 'hetero-' meaning different), a term coined in the early 1900s by geneticists studying hybrid vigor in crops and animals.
This is why mules (horse-donkey hybrids) are tougher than either parent, and why farmers love crossing different corn varieties—different genes create unexpected superpowers.
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