PEAZIT Aha card
Go straight to resources ↓Mitosis: divide copied DNA into equal sets
DNA is copied before mitosis. Mitosis separates sister chromatids into two nuclei, usually followed by cell division. Each daughter nucleus retains the original number of chromosome sets.
| Observation | What it means |
|---|---|
| Before DNA copying | 2n chromosomes |
| After mitosis | each nucleus has 2n |
One worked example
- Model: 4 chromosomesCount chromosomes, not chromatids.
- DNA is copiedEach chromosome has two sister chromatids.
- Two nuclei formEach receives 4 chromosomes.
Watch out: Chromatid counts and DNA amount change during the cycle. Here we compare the starting cell with completed daughter nuclei.
Goal, prerequisites and card origin
What you will learn: Distinguish DNA copying from chromosome-set count.
What you need first: Cells, nuclei and chromosomes.
An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1
Reference for the underlying principle ↗Show connections
DNA is copied before mitosis. Mitosis separates sister chromatids into two nuclei, usually followed by cell division. Each daughter nucleus retains the original number of chromosome sets.