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HomeHomework HelpbiologyPunctuated Equilibrium

Punctuated Equilibrium

Punctuated equilibrium is a theory in evolutionary biology that proposes species remain relatively stable for long periods, interspersed with brief episodes of rapid change and speciation, often in response to environmental shifts. This model contrasts with the gradualist view of evolution, which suggests that species evolve slowly and continuously over time.

intermediate
2 hours
Biology
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Overview

Punctuated equilibrium is a significant theory in evolutionary biology that challenges the traditional view of gradual evolution. It posits that species experience long periods of stability, known as stasis, interrupted by brief, rapid changes that lead to the emergence of new species. This theory i...

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Key Terms

Evolution
The process by which species change over time through genetic variation and natural selection.

Example: Darwin's finches evolved different beak shapes based on their food sources.

Speciation
The formation of new and distinct species in the course of evolution.

Example: The divergence of wolves and domestic dogs is an example of speciation.

Stasis
A period in which a species undergoes little or no evolutionary change.

Example: The horseshoe crab has remained relatively unchanged for millions of years.

Fossil Record
The history of life as documented by fossils, which provide evidence of past organisms.

Example: Fossils of ancient fish show how they evolved into land-dwelling animals.

Natural Selection
The process where organisms better adapted to their environment tend to survive and produce more offspring.

Example: Peppered moths changed color during the Industrial Revolution due to pollution.

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

Example: Darwin's finches adapted to different food sources on the Galápagos Islands.

Related Topics

Natural Selection
The process that drives evolution by favoring the survival of organisms best suited to their environment.
intermediate
Evolutionary Biology
The study of the origins and changes in the diversity of life over time.
intermediate
Fossilization Processes
Understanding how fossils are formed and what they tell us about past life.
advanced

Key Concepts

evolutionspeciationstasisfossil record