BRAINCAKEProphase
Prophase: The nuclear envelope breaks down and the and the nucleolus disappears.
Chromosomes shorten and thicken and become visible. Each chromosome consists of two identical chromatids held together at the centromere.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- nucleolus
- A dense structure within the nucleus where ribosomal RNA is made and ribosomes are assembled.
- centromere
- The region of a chromosome where the two sister chromatids are held together and where spindle fibres attach.
- chromatid
- One of two identical copies of a chromosome, joined at the centromere, formed by DNA replication.
- spindle fibres
- Protein fibres that extend across a dividing cell and attach to the centromeres of chromosomes, pulling them apart.
More in The Cell Cycle
- The Cell Cycle
- Mitosis
- Metaphase
- Anaphase
- Telophase
- Cytokinesis
- The Importance of Mitosis
- Cancer and the Control of Mitosis
All 12 lessons in The Cell Cycle · All AQA AS-level Biology topics