Overview and Evolution

When we think about sexes in animals, especially vertebrates, we often think along the lines of male and female. That categorization works for a lot of animals a lot of the time. However, nature rarely works with such clearly delineated distinctions. This section will be introduce you to the concept of sequential hermaphroditism, a type of natural sex change. Though not exclusive to them, we will be using teleost fish as a model to understand this phenomenon.

**Look at the amazing diversity of fish!** (https://commons.wikimedia.org/wiki/File:Fish_diversity.jpg)

In this section, you will learn:

What is sequential hermaphroditism?
What are the main schemes of sequential hermaphroditism in fish?
Why and how might these systems have evolved?

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