Transgenes that are most likely retained in a population of wild/weedy relatives are those that enhance fitness, that is, confer an advantage strong enough to promote the survival of the transgenic plant over the competitors in the wild/weedy population.
(Transgenes; are most likely retained; L:in a population of wild/weedy relatives) (those; enhance; fitness)
Transgenes those
are most likely retained enhance
L:in a population of wild/weedy relatives
fitness