[Coyoteman]

So we are the ancestors of Adam and Eve and the product of the marriages between their off-spring. But you don't need to go as far back as Adam - you just need to go back to the 8 on the Ark: Noah and Mrs. Noah, Shem and Mrs. Shem, Japeth and Mrs. Japeth, and Ham and Mrs. Ham....

Why do global patterns of mtDNA distribution not show this?

There is a skeleton from southern Alaska, dated to just over 10,000 years old. The mtDNA pattern is identical to extant local tribes, not a Middle Eastern pattern.

This suggests no break at the date ascribed to the global flood (ca. 2350 BC) and no replacement of earlier mtDNA patterns with the mtDNA of survivors of a global flood. (There are other examples of mtDNA continuity from the western US as well.)

[El Cid]

Re <22>
Why do global patterns of mtDNA distribution not show this?
There is a skeleton from southern Alaska, dated to just over 10,000 years old. The mtDNA pattern is identical to extant local tribes, not a Middle Eastern pattern.
This suggests no break at the date ascribed to the global flood (ca. 2350 BC) and no replacement of earlier mtDNA patterns with the mtDNA of survivors of a global flood. (There are other examples of mtDNA continuity from the western US as well.)

Either the dating of the mtDNA from the Alaskan sample (10,000 years) is incorrect, or the dating of the Flood (~2350 BC, referenced by Ussher, Newton, Kepler, et al) is incorrect.
I'm not dogmatic about whether the Flood occurred in 2350 BC, or 5000 BC (a date derived if one takes the 'begats' in Genesis 11 to mean generational time periods, and not direct father/son relationships) or some time in between, but I have no problem rejecting the 10,000 year mtDNA date.

I'll stick with age old presupposition that the Word of God (the Bible) is Truth. Once you read it, with your eyes being opened, you'll understand.