can two people have the same DNA?

Answer 1

The short version is yes. The long version is no.

There is no mechanism which prevents any person from having exactly the same DNA as someone else. I don't know how you'd do it, but there's nothing that would stop you.

And of course identical twins, if you trace them back far enough, come from a single cell. You can't get more identical than that. But the moment they separate, the differences start accumulating. Even in the DNA.

A typical cell has a copy error rate of about one error every ten thousand base pairs. Which is pretty good, all things considered. But since a typical human has three billion base pairs of DNA, it means that the FIRST time those twins' differentiate into two people, they will have around three hundred thousand differences in their DNA. And the differences only accumulate from there.

Of course some of those differences don't last (they're fatal for the cell that has them) and most are in places that don't matter (90% of human DNA does nothing). So it's quite possible that there will be no detectible difference in a DNA test... and even with a few small differences it's not likely to come up as someone different, just as 'static'.

And again, it's possible that even a total stranger might have an identical sequence in the small area that a DNA test looks at. Just not very likely.

Answer 2

In some DNA typing techniques (not all) a statistical probability is used to estimate the rareness of any particular type - in other words, the possibility that two samples originating from different sources might show the same pattern by chance alone. This type of calculation is valid only with respect to random individuals in a population; it is not applicable to closely related individuals. No two people share the same DNA type except for identical twins. However siblings potentially share more genetic material with each other than anyone else. This is because they inherit their genes from the same two people, Mom and Dad. This idea can be extended to more distant relationships such as children, grandchildren and cousins. In these relationships, some genetic material is shared, but the more distant the relationship, the fewer genes in common. For the highly variable DNA loci that are used in forensic testing, this means that even siblings are unlikely to test the same, especially when many highly variable markers are analyzed. However, until alibis are established all around, your best DNA defense is still "my brother did it..."

Answer 3

Yes twins can have the exact same DNA, though their is current research undergoing this because they have found some identical twins with varying DNA (dont recall exact article and no time to google it sorry), also theoretically if you clone someone they would have the same DNA as their clone...but thats a different topic. and too whoever says twins dont have the same dna they are wrong identical twins come from the same fertilized egg splitting resulting in two genetically undifferrentiated people.

Answer 4

The same DNA is the ideal characteristic of clones.

However, in normal cases, no two people have identical DNA, not even identical twins because of random mutations.

Answer 5

yes, some twins or others of same birth can have same dna. Proof is in a report about a girl trying to find out who fathered her child, both twins were exzact.

Answer 6

Answer is yes. Identical twins ( paternal do not) can have the same DNA. This makes it very hard if one commits a crime and there is no eye witnesses or other evidence to point to wich one committed the crime.

Answer 7

Identical twins have the same DNA, HOWEVER, they may have different gene being expressed (activated) due to normal cell development.

Answer 8

related people may have areas of dna that are similar but no one can have the exact same DNA

Answer 9

Identical twins can have the same genetic code. Although there may be slight variations due to mutations.

Answer 10

Monovular twins