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.
99.9% of the DNA from two people will be identical. The 0.1% of DNA code sequences that vary from person to person are what make us unique. These sequences are called genetic markers, and are the part of the code that forensic scientists use when doing a DNA test.