counterselection noun2 •Selection that removes unwanted characteristics.In all recipients, distant drug resistance markers streptomycin (SmR; rpsL104), chloramphenicol (CmR; recA::cat(FRT)), and/or nalidixic acid (NlR; gyrA96) were used for counterselection. — 2015 •Dysgenic selection (that has the opposite effects of natural selection). formscounterselections
