You are observing two plots of tobacco plants,one grown from seed that was the product of self-pollination,the other grown from seed that came from a cross.The latter,on average,performs better in terms of seed production due to

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The tobacco plants grown from cross-pollinated seeds have increased genetic diversity, which leads to greater adaptability and better performance in terms of seed production. Self-pollination limits genetic diversity and can lead to inbreeding depression.

You Are Observing Two Plots of Tobacco Plants,one Grown from Seed