Biology A-Level
DNA replication in S phase
What DNA replication in S phase means in Biology A-Level, as defined for OCR.
Definition of DNA replication in S phase
Check what you remember
Read the wording for your board, then hide it and explain DNA replication in S phase in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
During the synthesis phase of interphase, DNA is replicated so each chromosome becomes two sister chromatids before mitosis.
Topics that use DNA replication in S phase
- Cell division, cell diversity and cellular organisation (OCR A-Level)
Related terms
- anaphase
- Asexual reproduction and cloning
- Checkpoint control mechanisms
- Chromosome behaviour during division
- Consequences of loss of cell-cycle control
- Cyclins and cyclin-dependent kinases
- differentiation
- Erythrocyte structure and function
Using DNA replication in S phase in the exam
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