when two unreleased individuals or lines are crossed the performance of f1 hybrid is often superior to both the parents

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The correct terms is unrelated not unreleased.

The given statement explains the phenomenon called heterosis. Heterosis also known as 'hybrid vigour' is the improvement shown by progeny produced by crosses between unrelated individuals or lines due to increase in heterozygosity. It occurs when two homozygous individuals are cross pollinated.

 
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