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However, the heterosis effect no longer persists in the subsequent generations of these hybrids due to the segregation of genetic information.

But the neat, perfectly formed, soft-domed roses also remind me of hybrid vigor, or heterosis, a term used in genetics.

In addition to allelic variation, the variation in gene content may contribute to heterosis, as has been suggested for maize.

“But there is still no consensus as to what causes heterosis,”  Lippman said. 

But when one copy is working, you see the heterosis.