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Mutations

Random change to genetic material, either DNA or chromosomes
DNA mutations include base deletions, insertions or substitutions or
triplet repeats or deletions
Chromosome structures can suffer deletions, duplications, inversions or
translocations
They occur during DNA replication before nuclear division by mitosis
(somatic, not inherited) or meiosis (inherited)

Mutagens ­…

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Mutations 2

Mutations with neutral effects

Genes altered by a change in their base sequence result in different
alleles (forms of a gene)
If the base change results in a change in protein structure a different
characteristic may occur
New characteristics that are neither favourable or harmful are described
as…

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