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Diagram showing the process of mutation at the chromosome level.

(genetic biology)

Grammar: noun
plural: mutations
Definition:
~ a change of the DNA sequence within a gene or chromosome of an organism resulting in the creation of a new character or trait not found in the parental type

~ the process through which change occurs in a chromosome, either through an alteration in the nucleotide sequence of the DNA coding for a gene or through a change in the physical arrangement of a chromosome
Example:
1. Some Drosophila have a mutation in the Antennapedia homeobox gene which causes legs to form on head segments.

2. Multiple alleles result from different mutations of the same gene.
Related Word: mutant (noun), mutate (verb)