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heterosis| Improvement in physical capacities that sometimes occurs in the hybrid produced by mating two genetically different parents. |
| The parents may be of different strains or varieties within a species, or of different species, as in the mule, which is stronger and has a longer lifespan than either of its parents (donkey and horse). Heterosis is also exploited in hybrid varieties of maize, tomatoes, and other crops. |
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