mutational pressure

Mutational pressure refers to the tendency for biological mutations to occur disproportionately in one direction. Mutations are alterations in an organism's genetic material (DNA or RNA) that can be passed to descendants. These changes can arise from errors during normal cellular processes, like DNA replication, or from exposure to mutagens such as radiation or chemicals.12

Mutations are the fundamental source of genetic variation, which is essential for evolution. While mutation rates are generally low, their constant occurrence introduces new genetic variations into populations. These variations can be neutral, harmful, or occasionally beneficial, depending on the environment. The accumulation of mutations over time can lead to significant changes in gene frequencies within a population, a process that, combined with natural selection, drives evolutionary change.2345