1-(J1) Haplogroup is believed to have been generated some 10,000 years ago south of the Levant and in the heart of the Arabian Peninsula (Source is National Geographic Genetic Project)
2-(J1) Haplogroup is very common in Arabs (about 65%) (source is Semino et al.: Origin, Diffusion, and Differentiation of Y-chromosome Haplogroups E and J: Inferences on the Neolithization of Europe and Later Migratory Events in the Mediterranean Area) and (National Geographic Genetic Project).
3-Research shows that (J1) haplogroup makes about 72% of Yemen people, 34% of UAE people, 58% of Qatari people, 50% of Iraq people, 55% of Palestinian Arabs, 48% of Oman People, 34% of Tunisian, and 35% of Algerian. Rest of these countries populations is a mixture of Haplogroups. (Source: Y-chromosome diversity characterizes the Gulf of Oman by Cadenas et al. 2008) and (Semino et al. : Origin, Diffusion, and Differentiation of Y-Chromosome Haplogroups E and J: Inferences on the Neolithization of Europe and Later Migratory Events in the Mediterranean Area) and (The Levant Versus the Horn of Africa by J.R Luis et al 2004).
4-(J1) haplogroup had expanded to the rest of the world all over history but distinctively during two main periods. It had expanded out of Fertile Crescent about 7000-9000 years ago during the Neolithic times (last part of the stone age). The other period was during Arab migration with the expansion of Islamic empire on 6th century AC. (source Nadia Al-Zahery et al research).
5-For J1, M267 SNP must be positive. Under this SNP, all Arabs subgroup SNP exisits and the tree is ever expanding as more people test their YDNA
6-Main cluster of Arabic J1 holder were found around SNP L222. Two distinctive groups are visible those are have it and those who don't have have it. Many researchers have made many conclusions on its link to Adnanite or Qahtanite as well Hashemite linking. Refer to the research on the web for more information.
7-When same tribes cluster under same SNP, it draws clear distinction to their tribe YDNA signature and the all others who get same SNP are linked to same tribe Genetically.