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Principles of Evolution, Ecology and Behavior

Lecture 12: Sex Allocation

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Principles of Evolution, Ecology and Behavior (EEB 122)

Sex allocation is an organism's decision on how much of its reproductive investment should be distributed to male and female functions and/or offspring. Under most conditions, the optimal ratio is 50:50, but that can change under certain circumstances. Sex allocation determines what sexes sequential hermaphrodites should be at each part of their life as well as how simultaneous hermaphrodites should behave. Some species have more control over the sexes of their offspring than others, and adjust the sex ratios of their offspring depending on the environment and conditions.

00:00 - Chapter 1. Introduction
02:16 - Chapter 2. Shaw-Mohler and Male-Female Fitness Equivalency
10:00 - Chapter 3. Sex Ratios
18:39 - Chapter 4. Sequential Hermaphrodites
32:44 - Chapter 5. Sex Assignment in Offspring
43:48 - Chapter 6. Summary and Conclusion

Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses

This course was recorded in Spring 2009.

Course Description :

The Nature of Evolution: Selection, Inheritance, and History - Basic Transmission Genetics - Adaptive Evolution: Natural Selection - Neutral Evolution: Genetic Drift - How Selection Changes the Genetic Composition of Population - The Origin and Maintenance of Genetic Variation - The Importance of Development in Evolution - The Expression of Variation: Reaction Norms - The Evolution of Sex - Genomic Conflict - Life History Evolution - Sex Allocation - Sexual Selection - Species and Speciation - Phylogeny and Systematics - Comparative Methods: Trees, Maps, and Traits - Key Events in Evolution - Major Events in the Geological Theatre - The Fossil Record and Life's History - Coevolution - Evolutionary Medicine - The Impact of Evolutionary Thought on the Social Sciences - The Logic of Science - Climate and the Distribution of Life on Earth - Interactions with the Physical Environment - Population Growth: Density Effects - Interspecific Competition - Ecological Communities - Island Biogeography and Invasive Species - Energy and Matter in Ecosystems - Why So Many Species? The Factors Affecting Biodiversity - Economic Decisions for the Foraging Individual - Evolutionary Game Theory: Fighting and Contests - Mating Systems and Parental Care - Alternative Breeding Strategies - Selfishness and Altruism

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