Biology / Bio 0971 · Atom · ~20 seconds
Prometaphase I
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In prometaphase I, the nuclear envelope finishes fragmenting and each tetrad's two homologs attach to kinetochore microtubules from opposite spindle poles.
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One homolog of a tetrad captures microtubules from one pole while its partner captures microtubules from the opposite pole.
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Each homolog's two sister chromatids attach to the same pole here — only whole homologs attach to opposite poles.