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.
   Some 90+% or so of human DNA is the same between members of the  same species, but in a single human body--We have two copies of  each chromosome, two copies of every gene, and it is possible to  have two copies of the same allele.he only cells which lack DNA are the mature red blood  cells (erythrocytes). This is because they lack a  nucleus, which is where the DNA is found in other cells. Red blood â¦  cells also lack mitochondria which themselves have DNA.