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Lesson summary for:
Natural Selection & Sexual Selection: An Illustrated Introduction


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This illustrated video explores how natural and sexual selection can shape the way animals look and act, sometimes transforming the drab into the magnificent. To access the associated multiple choice and open answer questions, you'll need to register with the site.


Grade level:

15 minutes

Teaching tips:
Registration may be required to view the multiple choice and discussion questions. This video is best for students in an intro-level course.

Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details.

  • Evolution results from natural selection acting upon genetic variation within a population.

  • Natural selection and genetic drift act on the variation that exists in a population.

  • Natural selection acts on phenotype as an expression of genotype.

  • New heritable traits can result from mutations.

  • Inherited characteristics affect the likelihood of an organism's survival and reproduction.

  • Over time, the proportion of individuals with advantageous characteristics may increase (and the proportion with disadvantageous characteristics may decrease) due to their likelihood of surviving and reproducing.

  • Traits that confer an advantage may persist in the population and are called adaptations.

  • Sexual selection occurs when selection acts on characteristics that affect the ability of individuals to obtain mates.

Teacher background:

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