When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both parents. This phenomenon is called:

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heterosis. The superior performance of an F1 hybrid compared with both parents is called heterosis, also known as hybrid vigor. It commonly appears when unrelated or genetically distinct lines are crossed.

When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both parents. This phenomenon is called:

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