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Chapter 9 Opener: When a bull elk bugles, other males listen

Chapter 9 Opener: When a bull elk bugles, other males listen. 1. What evolutionary events led to the developemtn of the pseudopenis in the female hyena?. The pseudopenis of the female spotted hyena can be erected. (1) Concentrations of testosterone in male and female spotted hyenas (Part 1).

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Chapter 9 Opener: When a bull elk bugles, other males listen

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  1. Chapter 9 Opener: When a bull elk bugles, other males listen

  2. 1. What evolutionary events led to the developemtn of the pseudopenis in the female hyena? • The pseudopenis of the female spotted hyena can be erected

  3. (1) Concentrations of testosterone in male and female spotted hyenas (Part 1)

  4. (1) Concentrations of testosterone in male and female spotted hyenas (Part 2)

  5. (1) A cost of the pseudopenis for female spotted hyenas • Length of the birth canal significantly increased. Size of pup determines survival, therefore evolutionary trade off between pup survival and benefits from testosterone induced aggression and dominance rank, ability to reproduce and dominance of pups.

  6. (1) Competition for food among spotted hyenas may favor highly aggressive individuals

  7. (1) Dominance greatly advances female reproductive success in the spotted hyena

  8. 2. Describe possible evolutionary pathways for the developmetn of flight in stoneflies. • Arthropod gills have evolved into many different structures with different functions (Part 1)

  9. (2) Arthropod gills have evolved into many different structures with different functions (Part 2)

  10. 9.9 Evolutionary precursors of insect wings?

  11. 9.10 A surface-skimming stonefly

  12. 9.11 A possible evolutionary pathway from swimming to full flight in the stoneflies

  13. 3. Discuss the evolution of illegitimate signalers vs honest signalers. • .34 Deep croaks deter rivals – honest signal

  14. 9.36 Convergent threat displays • Honest signal – contest winner gets the female

  15. 9.38 An honest signal

  16. 9.39 A firefly femme fatale • Illegitimate signal – huge benefits – why did this evolve? Why doesn’t evolution select against this type of behavior?

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