The effects of genetics
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Some define genetic mutations as any change in the genetic make-up of an individual. By this definition, you have:

Point mutations where 1 base in a gene is changed to a different one

Deletion mutations where 1 or more bases of a gene are no longer present in the gene.

Duplications where 1 or more bases in a gene appear twice in succession.

Deletion mutations can be so large that several genes or even a larger part of a chromosome are missing.

Chromosomal mutations include things like inversions or duplications, and can also include the presence of additional copies of a chromosome or absence of one copy of a chromosome.
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