Identical twins

[JohnnyGus]

Are identical twins genetically 100% identical, or do they share nearly but not completely all their genes, which could be caused by mutations occuring before birth?

[Loosehead]

Yes, they are what you might call natural clones.

[Peter Pedant]

Eddie 51 is right

However, once the egg has divided into two it is not impossible for a mutation to occur in a cell which is then propagated and would cause some of the cells not to be identical.

trouble is that mutation rates are around 10 -5

in which case you would expect this effect to occur and be mnportant around once every ten thousand pair of identical twins.....

[ellis bell]

well i think they have some vert very differences like one does have a mole and the other doesn't.. and don't they sound different all the time??