Natural Selection

Definition

Natural selection is the process by which organisms that are better adapted to their environment tend to survive and produce more offspring. This leads to the perpetuation of favorable genetic traits in a population over time.

Mechanism

Natural selection operates through the following mechanisms:

1. Variation: Within a population, individuals exhibit variation in their traits, such as size, color, or behavior.
2. Heritability: Some of these traits are inherited and can be passed on to offspring.
3. Differential Reproduction: Organisms with advantageous traits are more likely to survive and reproduce, passing on their favorable traits to the next generation.

Examples

Some examples of natural selection in action include the peppered moth in England, where darker moths became more prevalent during the industrial revolution due to camouflage advantages, and the Galapagos finches studied by Charles Darwin, which exhibited different beak shapes based on their food sources.

Study Guide

1. Define natural selection and explain its significance in shaping the diversity of life on Earth.
2. Describe the mechanisms through which natural selection operates, using specific examples to illustrate each mechanism.
3. Analyze how environmental pressures can lead to the evolution of specific traits in a population over time.
4. Compare and contrast natural selection with other mechanisms of evolution, such as genetic drift and gene flow.
5. Discuss the role of adaptation and fitness in the process of natural selection.

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