sister chromatids
What sister chromatids means in Biology A-Level, as defined for AQA.
Definitions of sister chromatids
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain sister chromatids in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Two identical copies joined at a centromere, which each chromosome comes to consist of after the DNA is replicated in S phase.
After DNA replication in S phase, a chromosome consists of two identical sister chromatids joined at a centromere.
Two identical DNA molecules produced by replication, which mitosis then separates into daughter cells.
Topics that use sister chromatids
- All cells arise from other cells (AQA A-Level)
- DNA replication (AQA A-Level)
- DNA, genes and chromosomes (AQA A-Level)
Related terms
- acid hydrolysis and squashing
- alleles
- anaphase
- attachment protein and receptor
- base sequence
- cell plate and Golgi vesicles
- centromere attachment
- chromatid separation
Using sister chromatids in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge