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Originally Posted by JJ_BPK
Curiosity finally got me, I gave in and took the DNA test from 23andMe..
Results are about what I expected.. High North Western Europe percentage. Irish, Scotch, Swed..
Did miss on one, was always told my Mom's dad, Prosper Mazziott, was 100% Italian,, but only had a 2.1% hit?? 
The Neanderthal markers were what I expected,, BUT you probably already know that?? .. 
Has anyone, that took the test, tried to contact the suggested relatives?? They think I have several 1st cousins,, never heard of them..
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So doing some research into my own family tree led me to look for an answer that my father in law answered a retired professor but before that a molecular geneticist Phd in a cancer research institute....my mother is Swedish but my dads 1/4 native American which does not show up in DNA test for myself or himself so I had to ask to confirm my own research.....it was explained in laymans terms for me their are 2 main DNA types tested by these companies the Y-DNA, and the MtDNA as laid out in a link analysis it looks like this a man hands down the Y-DNA directly from father to son only that will only pass down to his son and so forth not from his daughter to her sons the daughter will only pass own the fathers Y within the G-nome but the Y will come from that childs father the MtDNA will only pass down from the mother to the daughter and to that daughters daughter and so forth. My daughters will and do have many Swedish characteristics and physical traits but none carry her Mt so Swedish or Native would never show up in their tests.
My Fathers mothers, father his grandfather the only one he knew was a full blooded Indian off a reservation but since it was his mother father their is no Y or Mt passed on from him and will never show in a Y or a Mt test the only way to prove this is the G-nome of an individual would need to be decoded to find out the truetraits that make us...us. My Gmother looked like a blue eyed Indian and my father though blonde as a kid started to take on some of his grandfathers physical characteristics of being Indian....but no matter how true it is their is no way to prove through DNA he shares the same DNA without the Gnome his own native heritage will be unknown.....going off the Y my surname is deeply rooted in the Viking gene.
What these tests boils down to is a bigger mystery given the Y goes from your father to his to his and so on and your Mt goes from your mother to her mother and so on but what is not seen in these tests without the Gnome being tore apart are the generations that are not in your direct Y or Mt lines which is most of our DNA which doubles every generation back the parents the 4 grandparents the 8 great grandparents then 16-32-64-128-256-512-1024 and so on....10 generations back you will have 1024 direct descendants of just those 10 generations only 10 men in the fathers direct line will share the Y and 10 women in a females direct line will share the Mt in the 10th generation to the direct female that leaves in every generation unaccounted for majority DNA so if we add up all the direct descendants minus the Y and Mt we end up with 20 out of 2032 and 2012 descendants heredity unknown by those tests.
Autosomal DNA is the new stuff and that is what the data bases are going to to do what they claim to do and that is to connect subscribers to relatives in a broader sense as in anyone who shares DNA....the father and the mother pass down DNA to a child in which the new DNA of the child will go through a recombination which allows us the differences between siblings as each will have its own recombination-ed DNA to allow for uniqueness as in traits physical, personality and responses to external stimuli etc....(The first steps of genetic drift and evolution sort-of how it starts out) essentially it is a more complete picture of your heredity as it will link you outwards to distant cousins in the same family tree but not just in the linear all the way back MtDNA for example will stay unchanged for up to 200 generations the Mt or Y. In my case the Autosomal tests would reveal the ancestors missing in the Mt and the Y (the majority) at least back a few generations but again it would take a reverse engineering of the G-nome to unlock the complete data.
copied
50% (parents and siblings)
25% (grandparents, aunts/uncles, half-siblings, double first-cousins)
12.5% (first cousins)
6.25% (first cousins, once removed)
3.125 (second cousins, first cousins twice removed)
0.781% (third cousins)
0.195% (fourth cousins)
Depending on the complexity of your DNA if your family tree goes in a straight lie that would leave your DNA relatively untouched and the recombination effect very little impact in comparison and therefore the tests would go farther back in generations....however the heinz 57 all american will not be able to go back very far due to the recombination no longer carry certain DNA from ancestors. I think something to remember in these things is how new the science is and how many humans have existed prior.