The entire genetic make-up of the plants is involved, just to fix one or two desirable genes, or to eliminate undesirable ones.

Desirable genes were to be cultivated; undesirable ones were to be extirpated.

One reporter observed that Schwa couldn't possibly "do less to preselect customers or filter out undesirable ones."

Why, then, should the Regents rush to give state education dollars to private schools that have greater flexibility to admit desired students and expel undesirable ones?

Because of where I get on and off the bus, the only seats available are usually undesirable ones.

It also refers to separating things that are desirable from undesirable ones.

Pick over the peas, discarding any broken or undesirable ones.

Scientists had long known of this fact by the time detectors were developed that could selectively detect desirable metals, while ignoring undesirable ones.

If television can be an influence for socially desirable actions, why not for undesirable ones, particularly on the most impressionable segment of its enormous audience?

When humans initially started farming, they used selective breeding to pass on desirable traits of the crops while omitting the undesirable ones.