Kalmar "monoploid" tana nufin yanayi ko yanayin samun nau'in chromosomes guda ɗaya a cikin tantanin halitta ko kwayoyin halitta. Matsayin ploidy ne wanda shine rabin lambar diploid, wanda shine adadin al'ada na chromosomes a yawancin ƙwayoyin somatic na kwayoyin halitta.A cikin kwayoyin halitta, monoploid yana wakiltar alamar "n", kuma Ana amfani da shi sau da yawa dangane da ƙwayoyin haploid ko kwayoyin halitta waɗanda ke ɗauke da saitin chromosomes guda ɗaya kawai. Misali, gametes (sperm and egg cells) sune monoploid cell domin suna dauke da nau'in chromosomes guda daya ne kawai. don yin nazari ko ƙirƙirar sabbin iri ta hanyar sarrafa kwayoyin halitta.