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INDEX of GCSE level CELL DIVISION notes on:

mitosis, meiosis and binary fission -  How do eukaryotic and prokaryotic cells multiply? - implications for growth, percentile charts, cancer, sexual or asexual reproduction

[Author © Dr WP Brown PhD: Doc Brown's biology exam revision notes suitable for students of UK IGCSE & GCSE level biology courses & ~ US grades 9-10 biology, page on cell-division updated Feb 10th 2026 *]

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Sub-index for this section on cell division (there is overlap between the 8 sections)

(1) Introduction - the cell cycle, cell division, DNA and chromosomes

(2) Detailed description of cell division by mitosis

(3) Cell division - number crunching cell replication, control factors

(4) Cell division, growth, development, percentile charts and cancer

(5) Other examples of mitosis: Plant growth and cancer

(6) Sexual reproduction and cell division by meiosis

(7) Comparing sexual and asexual reproduction

(8) Reproduction in prokaryotes - binary fission to replicate cells and more maths - full explanation of bacterial growth curve and its sequence of phases

There are various sections to work through, after 1, best read and studied in order 2 to 8


Summary of what is covered by the notes listed above

Based on the syllabus-specifications for students taking the AQA, Edexcel and OCR GCSE level biology examinations (~US grades 9-10).

Here’s a concise set of revision notes on types of cell division for Biology students:

Types of Cell Division

Cells divide to grow, repair tissues, and reproduce. The two main types of cell division are mitosis and meiosis.

1. Mitosis

  • Purpose: Growth, repair, and asexual reproduction.
  • Produces: Two genetically identical diploid daughter cells.
  • Stages:
    • Interphase: DNA replicates, cell prepares for division.
    • Prophase: Chromosomes condense, nuclear membrane breaks down.
    • Metaphase: Chromosomes align at the cell’s equator.
    • Anaphase: Chromatids separate and move to opposite poles.
    • Telophase: Nuclear membranes reform.
    • Cytokinesis: Cytoplasm divides, forming two new cells.

2. Meiosis

  • Purpose: Produces gametes (sperm and egg cells) for sexual reproduction.
  • Produces: Four genetically different haploid daughter cells.
  • Stages:
    • Meiosis I: Homologous chromosomes separate.
    • Meiosis II: Sister chromatids separate.
    • Result: Genetic variation due to independent assortment and crossing over.

Key Terms

  • Diploid (2n): Cells with two sets of chromosomes (e.g., body cells).
  • Haploid (n): Cells with one set of chromosomes (e.g., gametes).
  • Chromatid: One half of a duplicated chromosome.
  • Stem Cells: Undifferentiated cells that can develop into different cell types.

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GCSE level Cell biology revision notes index

Stem cells and an introduction to cell specialisation

Stem cells and an introduction to cell specialisation

Microscopy - the development and use of microscopes in biology 

Diffusion, osmosis, active transport, exchange of substances - examples fully explained

RESPIRATION - aerobic and anaerobic in plants, fungi and animals, conditions, substrates etc. 

ENZYMES - structure, function, optimum conditions, investigation experiments 

Genetics - from DNA to GM and lots in between!

DNA and RNA structure and Protein Synthesis  gcse biology revision notes

GENOME - gene expression - considering chromosomes, alleles, genotype, phenotype, variations

An introduction to genetic variation and the formation and consequence of mutations


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