counterselection

English edit

counterselection (countable and uncountable, plural counterselections)

Selection that removes unwanted characteristics.
- 2015 July 11, “Novel recA -Independent Horizontal Gene Transfer in Escherichia coli K-12”, in PLOS ONE‎^[1], →DOI:
  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.
(evolutionary theory) Dysgenic selection (that has the opposite effects of natural selection).