Sebaka (locus) ke eng?
Ka liphatsa tsa lefutso le liphatsa tsa lefutso, sebaka ke sebaka se itseng, se tsitsitseng ho chromosome moo gene e itseng kapa letšoao la liphatsa tsa lefutso le leng teng. Chromosome ka 'ngoe e na le liphatsa tsa lefutso tse ngata,'me lefutso le leng le le leng le na le sebaka se fapaneng kapa sebaka se fapaneng; ho batho, palo ea liphatsa tsa lefutso tse ngolang liprotheine ka har'a sehlopha se felletseng sa li-chromosome tse 23 e hakanyetsoa ho 19 000<unk>20 000.  Liphatsa tsa lefutso li ka 'na tsa e-ba le mefuta e mengata e tsejoang e le li-allele,' me ho ka boleloa hore allele e lula sebakeng se itseng. Lisele tsa diploid le polyploid tseo li-chromosome tsa tsona li nang le allele e tšoanang sebakeng se itseng li bitsoa homozygous mabapi le sebaka seo, ha tse nang le li-allele tse fapaneng sebakeng se itseng li bitsoa heterozygous. Lenane le hlophisitsoeng la libaka tse tsejoang bakeng sa genome e itseng le bitsoa'mapa oa liphatsa tsa lefutso. Ho etsa'mapa oa liphatsa tsa lefutso ke mokhoa oa ho khetholla sebaka se itseng kapa libaka tse ikarabellang bakeng sa ho hlahisa mofuta o itseng oa liphatsa tsa lefutso kapa tšobotsi ea likokoana-hloko. Ho etsa'mapa oa likamano, o tsejoang hape e le "mapa oa ho se leka-lekane ha khokahano", ke mokhoa oa ho etsa'mapa oa li-loci tsa litšobotsi tsa bongata (QTLs) tse sebelisang monyetla oa ho se leka-lekane ha khokahano ea nalane ho hokahanya li-phenotypes (litšobotsi tse ka bonoang) ho li-genotypes (mohaho oa liphatsa tsa lefutso), ho senola likamano tsa liphatsa tsa lefutso.