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The coding segment of DNA refers to the specific sequence of nucleotides that is responsible for encoding the information needed to produce a protein. This segment is made up of units called codons. Codons consist of three nucleotides and each codon corresponds to a specific amino acid or a signal to start or stop protein synthesis.
Option 2, "Muton", is not the correct answer. Muton is a term used to describe a specific mutation or a unit of mutation.
Option 3, "Intron", is also not the correct answer. Introns are non-coding segments of DNA that are present within genes and are removed during the process of mRNA maturation.
Option 4, "Exon", is also not the correct answer. Exons are the coding segments of DNA that are retained in mature mRNA after the removal of introns.
Therefore, the correct answer is option 1, "Codon".