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Unless you're worried about some really bad genetic predisposition for cancer, heart disease, or whatever, they're not really good for anything except posting the results on Facebook.
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Taking a test to look for genetic predispositions isn't a bad thing. Angelina Jolie's case of having the sweater puppies removed to prevent dieing early from breast cancer attracted a lot of attention to the BRCA1 & 2 genes. But she lost 3 female relatives to breast cancer and 3 to ovarian cancer. She had reason to be concerned. (Moment of silence for lost sweater puppies.)
23andMe's focus is on genetic health and they are back to doing (limited) reports on the samples in their database, and what people self-report by taking survey's.
Taking a test at any of the three big testing outfits means you can also use your results to get a readback on possible genetic issues with an outfit called Promothease. They'll look at your genetic code and compare you results against published research into genetics. (I think it costs $5.) Now, it's not the same as having a genetic counselor, but it can point out some 'red-flag' issues.
As always, don't rely on a $5 test to make a life changing decision. Test says you have an elevated chance of heart attack - think about your diet, or seeing a cardiologist. BRCA 1 comes back with the bad tag, and you've lost relatives to breast cancer - I wouldn't do an Angelina, but I might talk to a doctor or two.
Ethnicity is a different kettle of fish. Mostly.
There are genetic illness that can be passed along. Tay-Sach. Huntington's Chorea. Sickle cell anemia. Many, many more.
But if you're 99% European on paper and you're positive for sickle-cell - that's a danged unlikely combination, with out there being some Non Paternal Event somewhere along the line.
But at the top of those results - it says "ESTIMATES". Meaning, it could be wrong!
I'm 99.8% European, according to one of those tests. But the .2% Middle Eastern makes me wonder just what happened, way back when.