lecture02-slides - BioNB 2210 Lecture 2 Levels of Selection...

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1 BioNB 2210 Lecture 2: Levels of Selection toolbox lecture #2 Do animals behave for the good of the species or the good of themselves? Take-home messages from Lecture 1 “Lifetimes are sequences of cost/benefit decisions about how to maximize reproduction.” “Organisms are reproductively selfish.” Individuals behave in ways that enhance the spread of their own genetic materials, even if such behavior is detrimental to the survival of their population or species.”
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2 Today: The selfish gene view of behavior evolution “Evolution is gene frequency change.” “Individuals behave in ways that enhance the spread of their own genetic materials …” — Paul Sherman Crucial idea: To understand fully the evolution of behavior, we need to switch from thinking about reproductive success to thinking about genetic success . Reproductive success Genetic success good approximation, exact solution, often right always right
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3 3 phenomena where the view that “animals behave to maximize their reproduction” proves misleading. Meiotic drive in fruit flies Sterile workers in honey bees Suicidal behavior in meadow ants 100% 50% 50% X X XY 50% F 50% M 10 offspring 5F + 5M fertilized eggs X X X Y X X Y Female Male eggs sperm Perfectly fair meiosis!!!
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4 100% 50% 50% X X XY 50% F 50% M 10 offspring 5F + 5M fertilized eggs X X X Y X X Y Female Male eggs sperm X X X sr Y X X sr Y Female Male 100% 100% (perfectly unfair meiosis!!!) normal fly, 64 sperm developing per bundle X sr fly, 32 sperm developing 100% 50% 50% X X XY 50% F 50% M 10 offspring 5F + 5M fertilized eggs
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