Jul
20

Sexual Evolution

The Friday File: Plants and pests naturally evolve in an arms race of resistance and conquest that usually has no winners. But grafted trees, because they don’t reproduce sexually, are genetically identical to each other and thus never evolve. However, the pests that prey on these trees continue to sexually reproduce and therefore evolve. Thus, grafted specimens inevitably lose resistance and subsequently increasingly depend on herbicides and pesticides for survival.

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