Unit 4
Sexual Selection and
Reproductive Strategies

In this unit, we review some fundamental principles of primate social interactions. We first examine the different reproductive strategies of males and females, and discuss how the differences in strategies are linked to biological differences and relate to mate choice. We then discuss the theory of sociobiology, how it attempts to explain the differences in behaviour between males and females, and how it can explain social interactions within and between groups. We conclude this unit with a discussion of the weaknesses of the sociobiological approach.

Objectives

When you have completed Unit 4, you should be able to

1. define the concepts epigamic selection and intrasexual selection.
2. explain how sexual selection differs from natural selection.
3. explain how sexual selection creates physical differences between the sexes, and give examples of this process.
4. explain the relationship between social structure and intrasexual competition.
5. outline the theory of sociobiology.
6. outline the three key principles of sociobiology, and discuss the strengths and weaknesses of each principle.
7. explain how biological differences in reproduction between the sexes influence mate choice.
8. explain how biological differences in reproduction between the sexes influence the amount and type of parental investment.

Viewing Assignment

If you wish to complete your next viewing assignment now, you may choose any of the videos listed in Units 2 or 3.

Note: Once you have completed the viewing assignment to your satisfaction, please return the video to the Athabasca University Library as soon as possible: the number of copies is limited, and other students will need it. Remember, too, to submit your request for the video for your next viewing assignment—see pages 59-61 in Unit 5 of the Study Guide.