What do you expect with 1,300 years of interbreeding !
Qys and Yemen never interbreeded. The southern Yemenites believed they were the only true Arabs, descendants of one of Eber’s children, the Qys having come from a johny-come-lately descendant of Ishmael. So on the Arabian peninsula, there were never-ending feuds between the Qys and Yemen tribes, and no intermarriage at all. This bizarre feud spread along with Islam. Even Islamicized medieval Spain had never-ending feuds between native Spaniards because they, too, identified themselves as either Qys or Yemen. Mohammed, I believe, was a Qys. The entire age-old feud has subsided with the rise of Jew hatred, but even there it persists in altered form, as between Hamas and Fatah.