Biology / Unit 5 Bio 0971 short lesson, about 20 seconds
Prometaphase I
Captions available
The idea
In prometaphase I, the nuclear envelope finishes fragmenting and each tetrad's two homologs attach to kinetochore microtubules from opposite spindle poles.
In practice
One homolog of a tetrad captures microtubules from one pole while its partner captures microtubules from the opposite pole.
Where people slip
Each homolog's two sister chromatids attach to the same pole here — only whole homologs attach to opposite poles.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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