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.
1 Identical twins share the same DNA-but do not have identical DNA. 2  When the egg splits into two halves to form identical twins, the DNA may not divide equally between the two cells. 3  The basic concept is similar to when you cut an apple in half, the two halves may not look the same.