Race, Ancestry, and Relatedness

31 - 40 of 83 Answers

September 16, 2014: I am a docent at Ano Nuevo State Park, the Elephant Seal Rookery, and I am trying to find out what percentage of DNA humans share with seals. Do you have a rough idea of what percentage that would be? 
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September 9, 2014: If two kids have same dad but their moms are sisters and the sisters are from same mom and dad, are the kids full siblings or half? And how can we explain to them that they're not cousins but siblings?
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September 3, 2014: I am interested in finding out what genetic testing could possibly tell me about my father. I have a brother (shared maternal, different paternal) who will be tested as well. In reading through other responses I understand statistically we should be 25% related. Would the differences in our testing isolate the DNA I inherited from my father vs the differences we get from our shared maternal line mixing?
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July 23, 2014: I understand that everybody except sub-Saharan Africans has 2 to 4% Neanderthal genes. So they differ from pure Africans by this large amount. We differ from chimpanzees by 1.2%. How can this possibly be?
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February 12, 2014: I am a dog breeder and the question of line/inbreeding comes up often with fellow breeders. Here is my question—"Is there more chance of genetic flaws, undesirable diseases, etc. in mating a Mother to Son versus Father to Daughter?" Several breeders believe there is with a Mother to Son mating because of the X chromosome carrying more DNA.
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January 24, 2014: Why would an uncle and nephew share large identical segments on the X chromosome?  Could this mean parents/grandparents were related in some kind of way?
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January 9, 2014: My son's father has a half-sister. She has a daughter.  How are the son and daughter related?
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December 5, 2013: I recently saw a YouTube video about a white supremacist who took a genetic test and found out he was 14% sub-Saharan African.  What does that percentage mean?  When I listened to the video, the man said it was just statistical noise.  Could it have been?
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September 5, 2013: Can you please explain why half-siblings share 25% of their genes? If 50% comes from each parent, then they should, in theory have 50% from the common parent. I know this is not so, but I do not know why.
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August 1, 2013: I took the 23andMe test and found a relative that shares 22.2% DNA with me, over 33 segments. I am 31, and he is 27, from the same country.  We figured that we cannot be grandmother and grandson, since we are too close in age. Does this mean we are half brother and sister? Is there any other possibility?
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