Uploaded December 2024 | Updated September 2026, 3 weeks ago
Mutation bias refers to the idea that mutations do not occur across the genome in a uniform manner. Instead, certain types of mutations are more likely than others due to underlying physical and biological factors. For example, DNA repair mechanisms, nucleotide composition, and structure of the genome can make specific mutations—such as transitions (purine to purine or pyrimidine to pyrimidine changes)—more common than others, like transversions. Mutation bias does not determine evolutionary outcomes on its own but can influence them by creating a skewed pool of variations for natural selection to act upon, potentially skewing evolutionary trajectories.
Mutation bias refers to the idea that mutations do not occur across the genome in a uniform manner. Instead, certain types of mutations are more likely than others due to underlying physical and biological factors. For example, DNA repair mechanisms, nucleotide composition, and structure of the genome can make specific mutations—such as transitions (purine to purine or pyrimidine to pyrimidine changes)—more common than others, like transversions. Mutation bias does not determine evolutionary outcomes on its own but can influence them by creating a skewed pool of variations for natural selection to act upon, potentially skewing evolutionary trajectories.
