Phases of Mitosis — Prelims Strategy

Prelims Strategy

To excel in NEET questions on mitosis phases, a systematic approach is crucial. Firstly, thoroughly understand the sequence of events: Interphase (G1, S, G2) -> Prophase -> Metaphase -> Anaphase -> Telophase -> Cytokinesis.

For each phase, create a mental checklist of key events: what happens to chromatin/chromosomes (condensation, alignment, separation, decondensation), nuclear envelope (disappearance, reformation), nucleolus (disappearance, reappearance), and spindle apparatus (formation, attachment, shortening, disassembly).

Pay special attention to the number of chromosomes and DNA content (C value) at each stage. Remember that chromosome number is determined by the number of centromeres. In numerical problems, if a cell has '2n' chromosomes in G1, it will have '2n' chromosomes and '2C' DNA in G1, '2n' chromosomes and '4C' DNA in G2/Prophase/Metaphase, '4n' chromosomes and '4C' DNA temporarily in Anaphase, and '2n' chromosomes and '2C' DNA in each daughter cell after cytokinesis.

Practice identifying phases from diagrams. Distinguish clearly between plant and animal cytokinesis (cell plate vs. cleavage furrow). Be wary of trap options that mix events from different phases or confuse mitosis with meiosis.

Focus on keywords like 'condensation,' 'alignment,' 'separation,' 'reformation,' and 'cleavage furrow' or 'cell plate.