Die Studie der Universität Oxford ergab, welche Art von Berbern, die Al-Andalus genetisch beeinflusst haben, die nördlichen Mittelmeer-Berber oder die südlich der Sahara lebenden Tuareg. Das Ergebnis sind Nordküsten-Berber (90 %). Wüsten-Berber (0,8–1 %).

It’s not only al Andalus, it is thought that Iberian and North African populations have had a somewhat high degree of shared genetics since Antiquity. 
In any case it’s not clear to what degree al-Andalus influenced modern Spanish population, it is pretty hard to tell what proportion of Muslim population was displaced during Reconquista and how many silently converted and remained. It is clear it had some influence, at least in the southern half of the peninsula, but that’s the best estimate.