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heterosis

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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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? Mentioned in ? References in periodicals archive
 
The percentage of heterosis (hybrid vigor--the amount of increased yield) also tends to be less at higher yield levels.
Hybrid soybean patent on the way by Smith, Darrell / Farm Journal
Yield-boosting heterosis declines by a few percent with each succeeding generation of plants, notes Sanjaya Rajaram, director of the center's wheat programs.
Can grain yields keep pace? Stiff challenges face today's breeders - ... by Raloff, Janet / Science News
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