A tsakanin 1910 da 1915, Thomas Hunt Morgan da "Drosophilists" a cikin dakin gwaje-gwajensa sun yi amfani da waɗannan ra'ayoyin guda biyu a cikin "Mendelian-chromosome theory" na heredity. Sun ƙididdige abin da ake kira halayen kwayoyin halitta kuma sun yi iƙirarin cewa kwayoyin halitta suna zaune a kan chromosomes kamar yadda suke a kan beads; sun yi la'akari da haɗuwa da haɗuwa da haɗuwa da kwayoyin halitta na melanogophila, wanda ya zama samfurin da aka yi amfani da shi a cikin aikin Mendel. Ba da daɗewa ba bayan haka, masu binciken kwayoyin halitta (masana binciken kwayoyin halitta) sun ba da shawara cewa chromosomes sune kayan gado. Daga farkon shekarun 1920 zuwa 1915, Thomas Hunt Morgan da "Drosophilists" a cikin lab dinsa sun yi amfani da waɗannan ra'ayoyin guda biyu - duka biyu masu rikitarwa - a cikin "Mendelian-chromosome theory" na gado. Daga farkon karni na 20, da yawa daga cikin masu bincike sun yi amfani da ra'ayin halittar halittar halittar halittar halittar halittar
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