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Unit 3: Biological Psychology
3.3 Evolutionary Explanations of Aggression
3.3.2 Sexual Selection
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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.
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