Maximum parsimony

Definition

Maximum parsimony is a principle used in phylogenetic analysis that selects the simplest scientific explanation that fits the evidence. It aims to minimize the total number of evolutionary changes required to explain observed traits among species.

5 Must Know Facts For Your Next Test

1. Maximum parsimony assumes that the simplest tree with the least evolutionary changes is most likely correct.
2. It is also known as Occam's Razor in phylogenetics.
3. Parsimony methods compare different possible phylogenetic trees and choose the one with the fewest character state changes.
4. It relies on morphological and molecular data to infer evolutionary relationships.
5. The method can be computationally demanding, especially for large datasets.

Review Questions

• What does maximum parsimony aim to minimize in phylogenetic analysis?
• Why might maximum parsimony be preferred over more complex models?
• What types of data are used in maximum parsimony analyses?

Related terms

Phylogeny: The evolutionary history and relationship among species or groups of organisms.

Cladistics: A method of classifying species based on shared derived characteristics to determine evolutionary relationships.

Homoplasy: A characteristic shared by a set of species but not present in their common ancestor, often due to convergent evolution or evolutionary reversals.