[I want the USA back]

Could there have been OTHER mutations at OTHER times?

[Hawthorn]

>> Could there have been OTHER mutations at OTHER times? <<

For sure, IMHO. No matter how unlikely the possibility might be, I don’t see how — purely as a matter of logic — that it can be ruled out altogether.

Alternatively, could exactly the same “original” mutation have occurred for another individual?

Same answer.

[Red Badger]

Absoluetly!

Everything about ‘you’ is encoded in your genes.

A mutation can occur anywhere on the DNA molecule.........................