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As genetic techniques have advanced, it has become possible to look directly into the question of the ancestry of the Palestinians. In recent years, many genetic surveys have suggested that Jews and Palestinians (and in some cases other Levantines) are genetically closer to each other than either is to the Arabs of Arabia or to Europeans [6] [7] [8] [9]. (this collection contains more links to genetic studies of Jewish and middle eastern populations.) These studies look at the prevalence of specific inherited genetic differences (polymorphism) among populations, which then allow the relatedness of these populations to be determined, and their ancestry to be traced back (see population genetics). These differences can be the cause of genetic disease or be completely neutral (see Single nucleotide polymorphism) ; they can be inherited maternally (mitochondrial DNA), paternally (Y chromosome), or as a mixture from both parents ; the results obtained may vary from polymorphism to polymorphism. One study [10]on congenital deafness identified an allele only found in Palestinian and Ashkenazi communities, suggesting a common origin ; an investigation [11] of a Y-chromosome polymorphism found Lebanese, Palestinian, and Sephardic populations to be particularly closely related ; a third study [12], looking at Human leukocyte antigen differences among a broad range of populations, found Palestinians to be particularly closely related to Ashkenazi and non-Ashkenazi Jews, as well as Middle-Eastern and Mediterranean populations. (The latter study by Antonio Arnaiz-Villena has been the subject of intense controversy, it was retracted by the journal and removed from its website, leading to further controversy; the main accusations made were that the authors used their scientific findings to justify making one-sided political proclamations in the paper; that the retraction followed lobbyist pressure because the results contradicted certain political beliefs; some suggested that the broad scientific interpretation was based on too narrow data [13], whereas others support the scientific content as valid - for more information on the controversy : [14], [15], [16], [17].) If this close relatedness is true, it would confirm both Jews' and Palestinians' historical claims, suggesting a common Northwest Semitic ancestry. However, the results are complex, much work remains to be carried out, and partial results can be interpreted to suit diverse political agendas.
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