Foti n asuj wan gene addobat ad it waɣil s ichikil izlayan chund alwaq em n ground-finch wan Darwin isahrak BMP gene meɣ alwaq wa id ibas ilanat tachalen idaran nasnat chund Distal-less (DIx° gene tan ifanaz at waɣir meɣwar it waɣil ja daɣ ihandagan s addoben imudaran wi yadnen rattayan idaran nasan.