Natural Selection: Definition, Types & Examples

Instructions:

Choose an answer and hit 'next'. You will receive your score and answers at the end.

question 1 of 3

Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example of:

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1. A scientist has observed animals in a particular habitat for some time. She notices that the slowest gazelles tend to fall victim to predators more frequently than faster ones. Over time, she notes that the gazelle herd on average runs faster. She is observing:

2. A scientist has observed animals in a particular habitat for some time. She notices that in a population of birds those with either short or long beaks can find more food than those with average sized beaks. Over time, she notices a higher proportion of birds in the population have either short or long beaks. She is observing:

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About This Quiz & Worksheet

Taking a look at what can give us the edge in life, this quiz and corresponding worksheet will help you gauge your knowledge of the types of natural selection. Topics you'll need to know to pass the quiz include understanding examples of heterozygote advantage and balance polymorphism as well as knowing when directional selection might come into play.

Quiz & Worksheet Goals

Use this printable worksheet and quiz to review:

  • Examples of heterozygote advantage and balance polymorphism
  • Examples of directional selection
  • Types of disruptive selection
  • Effects of stabilizing selection

Skills Practiced

This worksheet and quiz will let you practice the following skills:

  • Interpreting information - verify you can read information regarding the type of disruptive selection and interpret it correctly
  • Problem solving - use acquired knowledge to solve natural selection type problems
  • Reading comprehension - ensure that you draw the most important information from the related natural selction lesson

Additional Learning

To learn more about this scientific theory, review the corresponding lesson called Types of Natural Selection. This lesson will help you:

  • Understand what natural selection is
  • Identify the main types of natural selection
  • Describe the characteristics of each type
  • Explain the difference between directional and disruptive selection
  • Appreciate when an organism would have a heterozygote advantage
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