Who were the Palestinians prior to Islam in the 7th century AD? They are the native Palestinians. Not the Muslim Palestinian land theives occupying the land today.
Descendants of the same people that were there at the start of the mandate, for the most part. They were Christians under the Byzantines and most converted to Islam under Muslim rule. Many reconverted to Christianity during the rule of the Latin Kingdom which ruled for about a century, and reconverted to Islam when Saladin. Do you think a few Arabians can change the genetic make up of a people. If that were the case they would have been Kurds after Saladin's invasion and Turks today. LOL
Yet their DNA is wholly arab with not a trace of any other DNA. They don't even have any Jewish DNA, yet the European Jews do.