The U.S. Constitutionâs 10th Amendment is arguably the most important of all the amendments in the brilliant document that helped shape the United States.
Not even identical twins have the same DNA--although theirs would be far closer than anyone else's. DNA changes over time. Odds of two siblings having the same DNA who did not split from the same zygote are vanishingly small.
DNA tests can also be helpful in proving if you and someone else have the same paternal or maternal line. 1  They can prove if two people with the same surname have an identical ancestor on the male line.  They can also prove if two people have the same maternal line.