Monday, November 15, 2010

Do Triplets Have the Same DNA?

Multiple births are very interesting. Triplets, if they come from the same egg that divides after fertilization, all have identical DNA. Identical triplets are very rare.

There are two other ways that triplets can occur. Non-identical triplets occur when three eggs are produced and each is fertilized separately, these triplets do not have the same DNA. The second way is for one egg to be fertilized and then divides creating two identical twins with the same DNA and then a second egg is fertilized. In this last example, two babies have the same DNA and third one is close but not identical.

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