A sudden, heritable change in the structure or amount of DNA in an organism is called
Avariation.
Bcrossing over.
Cadaptation.
Dmutation.CORRECT
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A mutation is a change in the genetic material, whether in a single gene (point mutation) or in chromosome number or structure, and it can be inherited if it occurs in gametes. Crossing over reshuffles existing alleles and creates variation without changing the DNA sequence itself.
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