3.3.2 Sexual Selection

• What is sexual selection a component of?

  Natural selection
• Sexual selection occurs because individuals with specific traits are more successful at attracting mates
• Sexual selection leads to traits that enhance reproductive success becoming more common in future generations.
• What is intrasexual selection characterized by?

  Competition for mates
• In intrasexual selection, individuals of the same sex compete for access to mates
• Intrasexual selection often leads to traits that enhance competitive ability.
• What is intersexual selection based on?

  Mate choice
• Intersexual selection occurs when one sex chooses mates based on specific traits
• Intersexual selection can lead to the evolution of traits that are attractive to the opposite sex.
• Match the type of selection with an example:

  Intrasexual selection ↔️ Male-male fighting

  Intersexual selection ↔️ Peacock's tail
• Both intrasexual and intersexual selection enhance reproductive success through different mechanisms.
• What is a key example of a trait evolved through sexual selection?

  Peacock's colorful tail
• Sexual selection can lead to the evolution of traits that make individuals more desirable to potential mates
• Intrasexual selection involves competition within the same sex for mating opportunities.
• What type of traits are often enhanced through intrasexual selection?

  Competitive ability
• What is the primary mechanism of intersexual selection?

  Mate choice
• Intersexual selection involves one sex choosing mates based on certain attractive traits.
• Intersexual selection involves one sex choosing mates based on certain traits
• Intrasexual selection involves competition between members of the same sex for mating opportunities.
• Intersexual selection involves one sex choosing mates based on competition.

  False
• Both types of selection drive the evolution of traits that enhance reproductive success
• What is an example of intrasexual selection leading to aggression?

  Stags fighting with antlers
• How does intrasexual selection contribute to aggression?

  By establishing dominance for mates
• Stags competing for mating rights by fighting with their antlers is an example of intersexual selection driving aggression.

  False
• Stags competing for mating rights by fighting with their antlers is an example of intrasexual selection driving aggression
• What is an example of intrasexual selection driving aggression?

  Stags fighting with antlers
• To understand intrasexual selection, it's helpful to contrast it with intersexual selection.
• Match the type of sexual selection with its description:

  Intrasexual Selection ↔️ Competition between same sex

  Intersexual Selection ↔️ Choice by one sex
• Intrasexual selection often leads to aggressive behaviors to establish dominance.
• What type of traits evolve under intersexual selection?

  Traits attractive to other sex
• Male-male fighting is an example of intrasexual selection, while a peacock's tail is an example of intersexual selection.
• Intrasexual selection is the primary driver of aggression in many species.
• How does intersexual selection influence aggression?

  Through mate choice
• Sexual selection is a key aspect of natural selection where certain traits enhance reproductive success.
• Intrasexual selection involves competition for mates, while intersexual selection involves mate choice.
• What are examples of traits enhanced by intrasexual selection?

  Size, strength
• What is the role of intersexual selection in aggression?

  Defend display territories
• Evolutionary explanations of aggression through sexual selection involve two main processes: intrasexual and intersexual selection.
• Evolutionary explanations of aggression neglect cultural and social factors.