Natural Selection and Trait Percentages in the Gene Pool

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6 Terms

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Gene Pool Definition

The gene pool is the total collection of all alleles (versions of genes) in a population.

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Genetic Variation

Populations have different alleles causing variation in traits among individuals.

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Natural Selection Process

  • Environmental pressures cause some traits to be more advantageous.

  • Individuals with advantageous traits are more likely to survive and reproduce.

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Changes in Trait Percentages

  • Because individuals with advantageous traits reproduce more, the alleles for these traits increase in frequency in the gene pool.

  • Alleles for less advantageous traits decrease in frequency.

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Result Over Time

  • The population evolves, with a higher percentage of individuals showing the advantageous traits.

  • This is how natural selection changes the genetic makeup of populations.

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Example

In a population of moths, dark-colored moths become more common in polluted areas because they are better camouflaged and survive predators better.