| Popis: |
Genetic variation is ubiquitous in natural populations of almost all organisms. Explanations for how these levels of variation are maintained involve the standard population-genetic processes of mutation, genetic drift, and natural selection. The selectionist view emphasizes the role of natural selection in actively maintaining particular genetic variants. The neutral hypothesis suggests that levels of variation are a balance between the generation of selectively neutral variation via mutation and its elimination by genetic drift. Both explanations have theoretical problems and fail to match all the data available. |
