Why to be the good guy/girl...
Altruism: action that benefits another at your own cost (e.g. birds: helpers at nest help parents raise young; individuals that sound alarm for predators might take higher risk of being captured)
“For the good of the species” -- is nonsense b/c natural selection works on individuals, not on species
Reciprocal altruism: beneficial to invest costs b/c “cheaters” will be excluded from future assistance (altruism benefits outweigh costs)
Blood is thicker than water -- altruism within relatives can increase survival of own genes ? kin selection (e.g. 2 of your brothers with 50% gene identity each will promote the same gene survival)
Haplodiploidy: bee males are haploid, females diploid ? sisters from one queen are 75% genetically identical; if each sister had her own offspring, she would only share 50% of genes with offspring