Why does cross-pollination often produce more or better-quality seeds than self-pollination?

Cross-pollination often results in more and higher-quality seeds compared to self-pollination because it facilitates outbreeding, which combines the hereditary traits of two different parent plants.12

This genetic mixing creates offspring that are more varied than those produced through self-pollination. While self-pollination can be a reliable reproductive strategy in stable environments, it often leads to an evolutionary "cul-de-sac" because it lacks the genetic diversity necessary for a species to adapt to changing conditions. In contrast, the increased genetic variability provided by cross-pollination enhances the overall fitness and adaptability of the population. A clear, practical example of this advantage is observed in hybrid corn, where cross-breeding specific lines produces a superior, more robust product.12