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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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.”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
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!!!
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 17

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online