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In maize, hybrid vigour is exploited by

1. crossing of two inbred parental lines
2. harvesting seeds from the most productive plants
3. inducing mutations
4. bombarding the seeds with DNA.

Correct answer: crossing of two inbred parental lines

Solution

Hybrid vigour (heterosis) in maize is expressed most strongly in the first-generation offspring of two inbred parental lines. Crossing inbred lines restores vigor and yields a uniform, high-performing hybrid.

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