There is no such thing as a UNIX kernel. UNIX is just a certificate from the opengroup ( www.opengroup.org ). Even Microsoft could have Windows become a certified UNIx if they wanted.

MacOSX is based upon BSD which is based upon AT&T's original unix operating system but IIRC they had to remove all of the original code from BSD because of licensing issues. So:

MacOSX is not UNIX.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob