Gene Mutations

A mutation that occurs at a specific fixed position (locus) of a gene on a chromosome due to change in one or few nucleotides is called a point mutation.

Gene mutations that occur during DNA replication due to errors in copying the DNA sequence are called copy-error mutations.

• Gene mutations involve changes in the fine structure and arrangement of nucleotides within DNA segments, directly influencing how a gene functions.
• Because a gene is located at a specific, fixed point on a chromosome, a mutation occurring at this location is referred to as a point mutation.
• These mutations typically occur at the molecular level during the process of DNA replication, which is why they are also classified as copy-error mutations.
• Any alteration in the standard nucleotide sequence can disrupt the genetic code, potentially causing adverse effects on the overall expression of the gene.