Origin and Function
Meiosis is ubiquitous among eukaryotes. It occurs in single-celled organisms such as yeast, as well as in multicellular organisms, such as humans. Eukaryotes arose from prokaryotes more than 1.5 billion years ago, and the earliest eukaryotes were likely single-celled organisms. To understand meiosis in eukaryotes, it is necessary to understand (1) how meiosis arose in single celled eukaryotes, and (2) the function of mitosis.
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