Neutral, Independent, Finite Sites Models
Most substitution models used to date are neutral, independent, finite sites models.
- Neutral
- Selection does not operate on the substitutions, and so they are unconstrained.
- Independent
- Changes in one site do not affect the probability of changes in another site.
- Finite Sites
- There are finitely many sites, and so over evolution, a single site can be changed multiple times. This means that, for example, if a character has value 0 at time 0 and at time t, it could be that no changes occurred, or that it changed to a 1 and back to a 0, or that it changed to a 1 and back to a 0 and then to a 1 and then back to a 0, and so on.
Read more about this topic: Substitution Model
Famous quotes containing the words finite and/or models:
“Sisters define their rivalry in terms of competition for the gold cup of parental love. It is never perceived as a cup which runneth over, rather a finite vessel from which the more one sister drinks, the less is left for the others.”
—Elizabeth Fishel (20th century)
“Today it is not the classroom nor the classics which are the repositories of models of eloquence, but the ad agencies.”
—Marshall McLuhan (1911–1980)