Natural Selection Process
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Questions and Answers

What is the primary requirement for natural selection to occur in a population?

Diversity within a species

What type of environmental condition can exert selective pressure on a population?

Abiotic (non-living) and biotic (living) environmental conditions

Why is natural selection considered a situational process?

Because it does not anticipate change in the environment

How do traits that seem to have no apparent relevance to survival in one situation become beneficial in another situation?

<p>Those traits are inherited by offspring and over many generations, there will be more and more individuals that inherit the allele for the desired trait</p> Signup and view all the answers

What is the ultimate result of natural selection acting on a population over many generations?

<p>A population that is better adapted to their environment</p> Signup and view all the answers

What drives the change in characteristics of a population over many generations through natural selection?

<p>The interaction between the environment and the heritable traits of individuals</p> Signup and view all the answers

What is the role of selective pressure in natural selection?

<p>It favors certain characteristics in some individuals and disfavors different characteristics in other individuals</p> Signup and view all the answers

Study Notes

Natural Selection

  • Natural selection is a process that occurs over many generations, where characteristics of a population change as organisms with heritable traits survive and reproduce, passing them to their offspring.
  • Diversity within a species is a required condition for natural selection to occur.
  • Abiotic environmental conditions can select for certain characteristics in some individuals and select against others.
  • The environment exerts selective pressure on a population, which can result from biotic factors like predators, parasites, and competition for resources.

Selective Pressure and Adaptation

  • Selective pressure is situational and does not anticipate environmental changes.
  • A trait that seems irrelevant to survival in one situation may become beneficial in another, helping certain individuals survive and reproduce.
  • The alleles for the beneficial trait are inherited by offspring, leading to an increase in individuals with the desired trait over many generations.
  • This process forms a population that is better adapted to its environment.

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Description

Explore the concept of natural selection, a gradual process that shapes species over generations through environmental pressures and heritable traits. Learn how diversity within a species enables this process to occur.

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