11 - 20 of 67 Answers
November 18, 2016:
I’ve heard that no one has the exact same DNA except for identical twins. But Ancestry.com DNA tests showed that my sister, mother, and I have the same DNA breakdown (100% Eastern European). My sister and I are not twins. What is the reason for this similarity? Should my other siblings take the test, too?
September 27, 2016:
I’ve heard that mitochondrial and Y chromosome DNA are useful for finding out whether two people are distantly related, but what makes these types of DNA better than regular DNA for learning about someone’s ancestry?
September 20, 2016:
I just had a DNA test done and it came back that my paternal Y-DNA was the rare haplogroup T. Can you tell me more about the T haplogroup?
August 10, 2016:
Is there mitochondrial DNA in human fingerprints? If yes, can it be used to identify a human being?
March 30, 2016:
I belong to 23andMe (DNA testing site) and have always wondered why it said I am more likely to have blue eyes. They use SNP: rs1393350 where I am a GG and rs12896399 where I am a TT. However, I have dark green eyes. Why do my SNPS that determine eye color basically say I should have had blue eyes when I clearly do not?
February 5, 2016:
If the Y chromosome is passed down from father to son intact, then is it possible for say, an Italian to marry an Irish woman 10 generations back, with no other Italians marrying into the line maternally, and the 10th generation to still be identifiable as an Italian in their DNA?
I read that you have 1/8 chance of not sharing DNA with a gr. gr. gr. grandparent, but what about the men and that Y chromosome?
January 12, 2016:
We recently got paternity results back saying that a child was my husband’s daughter. But it turns out that unknown to us when we did the testing, my husband’s brother could also have been the father. The testing company says that we need to have his brother tested to confirm that my husband is indeed the father but his brother refuses to get tested. What are our options?
August 19, 2015:
Can an X linked deficiency from a mother be avoided through PGD (Preimplantation Genetic Diagnosis)?
July 22, 2015: I recently found someone who might be my half-sister through 23andMe testing. Is there any way to tell if we share the same mom or dad? (I am male.)
February 25, 2015:
Can you tell someone's age from their DNA?