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Mutations are changes in the genetic material of an organism, occurring at the DNA or RNA level, and they form the basis of genetic variation. At the molecular level, mutations can arise due to alterations in the nucleotide sequence, including substitutions, insertions, deletions, and rearrangements of DNA. These changes can affect a single nucleotide, known as point mutations, or larger segments of chromosomes, leading to more significant structural mutations. Point mutations involve the replacement of one nucleotide with ______ __________ ____ _____ ___ ________ ______ ___ ________ ________ _____.
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