And that's the kind that counts, AFAWK.

Sure, 100% of _mitochondrial_ DNA is from Mama, but... OK, I couldn't *swear* it's totally unimportant, since science doesn't yet know quite *what* it's good for -- but then, doesn't that imply pretty strongly that it probably isn't anything really vital? I mean, if it were, we'd have *noticed* its influence by now.