PBS Evolution, Episode 5
Why Sex?
One of the most important engines of evolutionary change is sexual reproduction. Most organisms on Earth reproduce sexually, in spite of the time and effort involved in finding a suitable mate. Sexual selection is the root cause behind much of the extravagence seen in nature, particularly with birds, and may even have played a role in the development of certain aspects of human behavior.
Key Concepts: Asexual reproduction, sexual reproduction, clones, sexual selection, evolutionary psychology, behavioral adaptations.
Answer Key: Available at the biology instructor resources subscription page.
