Any sudden change in the genetic material is known as MUTATION.Mutation may occure at GENE LEVEL or CHROMOSOMAL LEVEL.
TYPES:
Missence mutation.
Nonsence mutation.
Sielent mutation.
Frame shift mutation.
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Semi conservative replication prevents mutations during DNA
replication because it produces 2 copies that each contained 1 of
the original strands and 1 entirely new strand.