CAIE IGCSE Biology 17.2.3 Chromosome Replication Before Mitosis
Practise explaining why chromosomes replicate exactly before mitosis and interpreting the associated doubling of DNA mass.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that every chromosome is copied exactly before mitosis begins
- identify DNA replication as the stage when DNA mass per cell doubles
- explain that copying allows each daughter cell to receive the same genetic information
17.2.3—Exact replication of chromosomes question 1
Fig. 6.2 shows a plant tissue in which cells are dividing by mitosis.
Fig. 6.2
Cell H in Fig. 6.2 is about to divide by mitosis.
State what happens to the chromosomes in cell H before mitosis takes place and state why it is necessary.
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