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@study How many phases does mitosis have?
Mitosis has four phases: prophase, metaphase, anaphase and telophase, though some textbooks add prometaphase between the first two.1
1 lecture-mitosis.mp3 2:02–3:03
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Sample lecture lecture-mitosis.mp3 2:02
Mitosis itself has four phases: prophase, metaphase, anaphase and telophase. Some textbooks add prometaphase between prophase and metaphase; I’ll mention it, but we’ll work with four. In prophase the chromatin condenses into visible chromosomes, the nucleolus disappears, and the centrosomes move to opposite poles and start building the spindle.
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A practice question
The lecture mentions prometaphase but works with four phases of mitosis. Which four, and where would prometaphase fit?
Correct
Exactly: the four phases in order, and prometaphase fits between prophase and metaphase, when the nuclear envelope breaks down.
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What happens to the chromatin in prophase?
It condenses into visible chromosomes.
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Library Cell biology
- lecture-mitosis.mp3 44.1 MiB Listening Transcribed
- lecture-cell-cycle.mp3 38.6 MiB
- slides-mitosis.pdf 3.4 MiB
- Mitosis – Wikipedia 212.7 KiB
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lecture-mitosis.mp3 · Transcript
2:02 Mitosis itself has four phases: prophase, metaphase, anaphase and telophase. Some textbooks add prometaphase between prophase and metaphase; I’ll mention it, but we’ll work with four.
3:03 In prophase the chromatin condenses into visible chromosomes, the nucleolus disappears, and the centrosomes move to opposite poles and start building the spindle.
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@study How many phases does mitosis have?
Mitosis has four phases: prophase, metaphase, anaphase and telophase, though some textbooks add prometaphase between the first two. In prophase the chromatin condenses into chromosomes and the spindle forms.
open a citation
1 lecture-mitosis.mp3 2:02–3:03
Mitosis itself has four phases: prophase, metaphase, anaphase and telophase. Some textbooks add prometaphase between prophase and metaphase; I’ll mention it, but we’ll work with four.
2 lecture-mitosis.mp3 3:03–4:04
In prophase the chromatin condenses into visible chromosomes, the nucleolus disappears, and the centrosomes move to opposite poles and start building the spindle.
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How practice worksthat textbook aside? now it’s a question
Where do the textbooks that add it put prometaphase?
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Correct
Exactly: it falls between prophase and metaphase, when the nuclear envelope breaks down.
Not quite
The lecture puts it between prophase and metaphase, when the nuclear envelope breaks down.
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lecture-mitosis.mp3
from the lecture, at 3:03
In prophase the chromatin condenses into visible chromosomes, the nucleolus disappears, and the centrosomes move to opposite poles and start building the spindle.
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Notes and diagramsthe four phases, sketched
lecture-mitosis.mp3
from the lecture, at 2:02
Mitosis itself has four phases: prophase, metaphase, anaphase and telophase. Some textbooks add prometaphase between prophase and metaphase; I’ll mention it, but we’ll work with four.
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