(macroevolution)

Definition

Macroevolution is the large-scale evolutionary changes that occur over long periods, leading to the emergence of new species and higher taxonomic groups. It contrasts with microevolution, which involves smaller evolutionary changes within a species.

5 Must Know Facts For Your Next Test

1. Macroevolution encompasses processes such as speciation and extinction.
2. It can be driven by mechanisms like genetic drift, natural selection, and gene flow.
3. Fossil records provide key evidence for macroevolutionary changes.
4. Major evolutionary events include mass extinctions and adaptive radiations.
5. Macroevolutionary patterns can be studied through phylogenetic trees and comparative anatomy.

Review Questions

• What are some mechanisms that drive macroevolution?
• How does macroevolution differ from microevolution?
• What types of evidence support macroevolutionary changes?

Related terms

Speciation: The process by which new distinct species arise.

Genetic Drift: Random changes in allele frequencies within a population.

Adaptive Radiation: The rapid evolution of diversely adapted species from a common ancestor.