1. Bonus 1 due W 2/28
I hope she likes my
feathers because I am
tired of dragging them
around everywhere.

2. better off helping with these kids or should I mate with someone else?
Am I the only one? Am I
better off helping with these
kids or should I mate
with someone else?
Is this the best I can do?
Maybe I can find someone
with better genes or
more genetic diversity.

3. 1
Which is male? 2

4. 1
Which is male? 2

5. Female grizzly bears cannot reproduce while lactating
Female grizzly bears cannot reproduce while lactating. Therefore they can only reproduce every once every 3 years…

6. …this leads to competition between males

7. Sexual Dimporphism: differences between males and females

8. Average height/weight by sex in U.S.

9. Ratio of Weight Male/Female
M/F

10. Bonobos

11. Primates have different reproductive stratagies

12. Ratio of Weight Male/Female
M/F

13. Testes Compared to Overall Weight
Testicle size (oz) per body weight (lbs)

14. Pipefish: related to seahorses

15. Pregnant Male:
Males care for developing eggs

16. Males care for developing eggs

17. The Measurement of Sexual Selection Using Bateman’s Principles:
An Experimental Test in the Sex-Role-Reversed Pipefish Syngnathus typhle (2005)
Integrative and Comparative Biology, 45:874–884
Adam G. Jones, Gunilla Rosenqvist, Anders Berglund, and John C. Avise

18. frequency
number of mates
Jones et al. Fig. 1

19. frequency
number of mates
Jones et al. Fig. 1

20. frequency
number of mates
Jones et al. Fig. 1

21. The sex ratio affects who will successfully reproduce
The sex ratio affects who will successfully reproduce. Pipefish females are more affected.
Jones et al. Fig. 1

22. number of individuals
body length (mm)
Jones et al. Fig. 4

23. number of individuals
body length (mm)
Jones et al. Fig. 4

24. medium sized female pipefish are most successful at reproducing while size is less critical for male pipefish
Jones et al. Fig. 4

25. Different reproductive strategies lead to differences in sexual dimorphism.