(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
- Macroevolution encompasses processes such as speciation and extinction.
- It can be driven by mechanisms like genetic drift, natural selection, and gene flow.
- Fossil records provide key evidence for macroevolutionary changes.
- Major evolutionary events include mass extinctions and adaptive radiations.
- 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?
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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.
