Gene flow

Exchange of genes between different, usually related, populations [through cross breeding]. Genes commonly flow back and forth among plant [populations] via transfers of pollen.

Source: Base de Dados Tropical Glossary 

In agriculture, this process can occur between crop plants and sexually compatible wild relatives regardless of whether the crop plant was developed through conventional plant breeding or biotechnology.

Source: GreenFacts, based on CBI Gene flow to wild plant relatives 

Genetic cross - Hybrid (plant or animal)

Español: Flujo de genes
Français: Flux de gènes

Genetically Modified Crops