Semi-conservative replication of DNA prevents mutations because every new base that is added to a growing daughter strand during replication has to pair with the original strand.
Semi-conservative replication of DNA
When DNA replicates or makes a copy of itself, one of the old strands forms the template for the synthesis of a new strand.
In other words, the two double-helix DNA that results from replication consist of one old strand and one new strand.
Thus, the integrity of the old strand remains intact.
By doing so, every new base that would be synthesized during replication has to pair with the bases of the old strand. This ensures that mistakes (mutations) are avoided.
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