From anteaters to zebras, why are both sexes equally represented in number? Explore a quirk in evolution with a video from a thought-provoking science playlist. The narrator shows examples of species that might only need a few males, then discusses how natural selection always causes the numbers of males and females to even out over generations.

Concepts

evolution, natural selection, adaptations, males, females, offspring, probability, sexual reproduction, inherited traits

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Additional Tags

science

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Instructional Ideas

• Pose the question of equal numbers between sexes to the class to get them thinking about it before the video begins
• Have individuals research to find examples of animal species where numbers are not equal
  

Classroom Considerations

• Show the video after pupils have knowledge about evolution and natural selection
  

• This video is hosted on YouTube

Pros

• Humor and great scripting make the video very enjoyable
• The subject matter is explained in student-friendly terms
  

Cons

• None

Common Core

SL.6.2 SL.7.2 SL.9-10.2