Mutagen in NOT the only way mutations can occur.
Explanation:
DNA replication is not usually perfect with 100% precision. Mistakes are sometime made by DNA polymerase, on rare occasions, in the process of replication that even get left out by error-correction mechanisms. This, therefore, can sometimes cause point mutations in the DNA. The error rate is however very low at approximately 10⁻⁹ to 10⁻¹¹ errors per base pair. Therefore mutagens are NOT the only cause of mutations in DNA.
Learn More:
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