The Evolution of Meiosis, an Open Question
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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.
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Researchers studying early-branching eukaryotes such as Giardia look for clues to which mitotic features meiosis first modified.
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This is a live evidence gap, not a settled account awaiting confirmation — the course states no verdict here.
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