Haɗin Halittar Halittu yana nufin yanayin wasu kwayoyin halitta waɗanda ke kan chromosome ɗaya don gado tare a matsayin naúrar, maimakon na kansu. Mafi kusancin kwayoyin halitta guda biyu suna kasancewa da juna akan chromosome, gwargwadon yiwuwar a gaji su tare. Wannan al'amari ya faru ne saboda kusancin jiki na kwayoyin halitta akan chromosome da kuma kasancewar sau da yawa ana yada su azaman naúrar yayin aiwatar da meiosis. Za a iya amfani da haɗin kai don yin taswirar inda kwayoyin halitta suke a kan chromosome da kuma nazarin gadon dabi'un halitta.