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The main advantage of F1 hybrids in agriculture is also their drawback. When F1 cultivars are used as parents, their offspring (F2 generation) vary greatly from one another. Some F2s are high in homozygous genes, as found in their grandparents, and these will lack hybrid vigour. From the point of view of a commercial seed producer who does not wish customers to produce their own seed via seed saving, this genetic assortment is a desired characteristic.