Competing Hypotheses for the Eukaryotic Nucleus's Origin
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Three hypotheses compete for how the eukaryotic nucleus arose, nucleus-first, mitochondria-first, and eukaryote-first, and the field has not settled which, if any, is correct.
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Nucleus-first proposes the nucleus evolved before mitochondria joined; mitochondria-first proposes the reverse; eukaryote-first proposes prokaryotes evolved from eukaryotes by losing genes and complexity.
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All three hypotheses remain testable and contested — this entry declares no winner.
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