The Costs and Benefits of Interacting

Social Interactions and Cooperation

Cooperation among Unrelated Individuals

• Reciprocity

Shared Genes and the Evolution of Altruism

• Spite

Conflict and Cooperation in Close Quarters: The Family

• Conflict between mates
• Murder in the family
• Parent-offspring conflict
• Eusocial animals: The ultimate families

Levels of Selection

• Selfish DNA
• Selfish mitochondria
• Group selection

Cooperation and Major Evolutionary Transitions