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Cell Cycle and Cell Division is a short chapter, but its questions test whether you can track two numbers at once, chromosome count and DNA content, through every stage. Learn that and most of the chapter falls into place.
Is cell cycle and cell division in the NEET syllabus?
Yes. The updated NEET (UG) 2026 syllabus from the National Medical Commission, dated 22 December 2025 and linked from the official NEET (UG) site at neet.nta.nic.in, lists cell division under Biology Unit 3, Cell Structure and Function, as "Cell cycle, mitosis, meiosis and their significance". The syllabus lists topics, not question counts, so treat any chapter percentage you see online as an estimate. Check neet.nta.nic.in for any NEET (UG) 2027 revision.
In the current NCERT Class 11 Biology book (2026-27 reprint), this is Chapter 10, after Cell: The Unit of Life and Biomolecules. It has five sections: 10.1 the cell cycle, 10.2 M phase, 10.3 significance of mitosis, 10.4 meiosis and 10.5 significance of meiosis. If cell structure itself feels shaky, our guide to Cell: The Building Block of Life from the new Class 9 book is a quick warm-up.
How do chromosome number and DNA content change through the cycle?
NCERT section 10.1 states the key rule: in S phase the DNA per cell doubles from 2C to 4C, while the chromosome number stays 2n (NCERT Chapter 10). Here is the full chain for a diploid cell, with a human cell in brackets (humans have 46 chromosomes, per genome.gov):
G1: 2n chromosomes, 2C DNA (46 chromosomes, one chromatid each)
S: DNA rises from 2C to 4C; still 2n (46)
G2: 2n, 4C (46 chromosomes, 92 chromatids)
Mitosis, prophase and metaphase: 2n, 4C (46)
Mitosis, anaphase: sister chromatids separate, so the cell briefly holds 4n chromosomes at 4C (92)
After mitosis and cytokinesis: each daughter cell is 2n, 2C (46)
Meiosis I, prophase I to anaphase I: 2n, 4C (46, as 23 bivalents until homologues part)
After meiosis I: each cell is n, 2C (23 chromosomes, 46 chromatids)
Meiosis II, prophase II and metaphase II: n, 2C (23)
Meiosis II, anaphase II: 2n in the cell for a moment, 2C (46)
After meiosis II: four cells, each n, C (23)
Worked example. Try a number NCERT does not use. A plant cell has 2n = 20 and its G1 nucleus holds 6 units of DNA. In G2 it has 20 chromosomes and 12 units. At mitotic anaphase: 40 chromosomes, 12 units. Each mitotic daughter: 20 and 6. At metaphase I you see 10 bivalents (40 chromatids, 12 units). After meiosis I: 10 chromosomes, 6 units. At anaphase II: 20 chromosomes, 6 units. Each final cell: 10 chromosomes, 3 units.
Which traps cost marks in this chapter?
Saying S phase doubles chromosomes. It doubles DNA; chromosome number stays the same.
Calling interphase idle. NCERT points out that in a human cell in culture the cycle takes about 24 hours, division itself about an hour, and interphase over 95% of the time, spent growing and copying DNA (NCERT Chapter 10).
Mixing up the two anaphases. Homologous chromosomes part in anaphase I; sister chromatids part in anaphase II, as in mitosis.
Assuming DNA is copied between the two meiotic divisions. It is not: interkinesis has no replication.
Jumbling prophase I. Pin one event to each substage: leptotene (condensing), zygotene (synapsis, synaptonemal complex), pachytene (crossing over by recombinase), diplotene (chiasmata appear), diakinesis (chiasmata terminalise).
Treating G0 as dead. Quiescent cells stay metabolically active; they just stop dividing unless the body needs more cells.
Believing only diploid cells divide by mitosis. NCERT notes haploid cells in some lower plants and social insects do too.
How should you revise cell division in one week?
Day 1: Read 10.1 and 10.2, then draw the cycle and mitosis from memory.
Day 2: Rebuild the count chain above on blank paper for 2n = 46, then for a new 2n.
Day 3: Read 10.4 and write the five prophase I substages with one event each, without looking.
Day 4: Draw mitosis and meiosis side by side; circle every difference.
Day 5: Attempt the NCERT end-of-chapter exercises closed-book, then check against the text.
Day 6: Solve past NEET questions on this chapter; our guide on how to use previous year questions for JEE and NEET shows how to log mistakes by type.
Day 7: Redo only what you got wrong, and write the significance of mitosis and meiosis (10.3, 10.5) in your own words.
Meiosis is where this chapter meets reproduction; our guide to Reproduction: How Life Continues from the new Class 9 book recaps why gametes carry half the chromosomes.
If one stage still will not click, the Fermi Concept Library covers every concept in physics, chemistry, biology, mathematics and computing, each with its own lesson and its place in the map.
Start tonight: write the count chain for 2n = 46 with the book closed. Whatever you cannot fill in is your first task.
