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heterosis

Pronunciation: het'er-o'sis

Definition: The beneficial effect on the phenotype of crossing (hybridization) on growth, vigor, and physical or mental qualities in a strain of plants or in animal stock, as measured by the difference between the midparent mean phenotype and that of F1; also referred to as hybrid vigor.

[hetero- + -osis, condition]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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