Biology / Unit 4 Bio 0857 short lesson, about 20 seconds
Prophase
Captions available
The idea
Prophase is mitosis's first stage: the nuclear envelope begins breaking down, chromosomes condense into visible structures, and spindle microtubules extend from the separating centrosomes.
In practice
A newsroom coiling cables and staging cameras before broadcast resembles prophase, visible preparation ahead of the main event.
Where people slip
Condensation in prophase is physical coiling for safe movement, not the DNA replication that already happened, in S phase.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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