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(D) Outbreeding usually takes place between members of different varieties or strains and in certain plants of closely related species. The resulting

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Hybrid vigour

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(D) Outbreeding usually takes place between members of different varieties or strains and in certain plants of closely related species. The resulting progeny is known as a hybrid. When the hybrid exhibits phenotypes showing characteristics that are superior to either of the parental stocks,this phenomenon is known as hybrid vigour or heterosis (as defined by Shull).

Superiority of hybrid over parents is known as:

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