Biology / Unit 5 Bio 1003 short lesson, about 20 seconds
The Evolution of Meiosis, an Open Question
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The idea
How meiosis evolved from mitosis is unresolved: one leading view holds it arose through stepwise changes to mitotic machinery, homolog pairing being the hardest step.
In practice
Researchers studying early-branching eukaryotes such as Giardia look for clues to which mitotic features meiosis first modified.
Where people slip
This is a live evidence gap, not a settled account awaiting confirmation — the course states no verdict here.
Your place on the trail
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