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.
Irrespective of the cell or tissue source (e.g., blood, saliva, semen, hair root), DNA from any particular individual is consistent throughout the body of that individual. It is extremely unlikely that any two individuals will have the same genetic makeup unless they are identical twins.