(C) The spontaneous mutation rate for a single gene in most organisms is estimated to be approximately one mutation per $10^6$ to $10^9$ $DNA$ replica

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(C) The spontaneous mutation rate for a single gene in most organisms is estimated to be approximately one mutation per $10^6$ to $10^9$ $DNA$ replications. This rate reflects the high fidelity of $DNA$ polymerase enzymes during the replication process,which include proofreading mechanisms to minimize errors.