Angela
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J1 has nothing to do with J2a or J2b
J1 is turned to a semitic characteristic
while J2a a south caucas that turns as a characteristic of mediterenean and black sea
and j2b semms to be connected with some waves of IE
the role of J2a is still uncertain and until now can not be defined,
for example we do not know much Minoan, Pontic, Phoenician was,
but we know was a seafring HG that spread all over mediterenean and black sea,
J1 has different subclades. We just don't know very much about them because the money and the hobbyist community is more interested in R1a and R1b. What used to be called J1e or P58 is the "Semitic" clade. It is extremely frequent in the Arabian peninsula because of a founder effect there. The consensus still seems to be that J1 arose somewhere around the Zagros, but many clades, including J-P58, moved south. There are clades of J1 in Europe that have nothing to do with the Arabian peninsula. It's not totally clear yet when they arrived or what migrations were responsible for them. There are threads that discuss it at more depth if you are interested in it.
I agree that J2's center of gravity is further north. I also agree that we may find that some subclades of J2 were involved in some waves of IE migrations.