genetic screening

Prevalence depends on context, and sometimes unique advantages outweigh the genetic costs.

A man had come to stand beside it, his body screening the light of one of the lamps that hung from a rafter of the ceiling.

Nearer came the feet, and I peered between the interstices of the screening balustrade.

Of course, human beings could not exist in such a scene, save by closely hugging the ground, or screening themselves behind trees.

It was not entirely for the money that he undertook the laborious task of washing "riffles" and "screening tailings."

With a staff in one hand and screening her eyes with the other, old Rachel comes sidling down the steps.