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THE VISUAL LEARNING STUDIO
See the idea. Understand the connection.
35 visual explanations across 29 chapters, with topic maps throughout the library.
The chapter index will grow as additional notes are prepared. Chapters shown here are a learning collection, not a claim that the entire exam syllabus is complete.
SEE IT. CONNECT IT. EXPLAIN IT.
Understand the chapter visually
2 visual explanations · Study the connections, then test yourself.
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FOLLOW THE PROCESS
Cell cycle: copy first, divide next
1
G₁ phase
Cell growth and normal metabolic activity.
2
S phase
DNA is replicated. DNA content doubles; chromosome number does not simply double.
3
G₂ phase
Further growth and preparation for division.
4
M phase
Nuclear division and usually cytokinesis produce daughter cells.
The connection Interphase consists of G₁, S and G₂. It is an active interval, not a resting phase.
Exam trap DNA replication belongs to S phase, not prophase.
Does the chromosome count double during S phase?
No. Each chromosome acquires two sister chromatids, while the chromosome count by centromeres stays the same.
Study the expanded notes and the credited detailed textbook lessons. The current chapter index covers core topics; it is not a claim of exhaustive coverage of every examination syllabus. Check the official syllabus and primary references.
Cell Cycle and Division — lesson overview
Cell-cycle organisation
The cell cycle includes growth, DNA replication and division, with regulation determining whether and when a cell proceeds.
Interphase includes G₁, S and G₂ in the standard description; DNA replication occurs in S phase. Interphase is not merely an inactive rest.
DNA amount and chromosome count are different measurements. Replication produces sister chromatids without simply doubling every chromosome count convention.
Mitosis
Mitosis distributes replicated chromosomes into daughter nuclei through prophase, metaphase, anaphase and telophase in the usual outline.
Sister chromatids separate during anaphase. Cytokinesis divides the cytoplasm and can differ between plant and animal cells.
Mitosis generally maintains chromosome number in the resulting nuclei, though context and abnormal division must be distinguished from the standard model.
Meiosis
Meiosis involves one DNA replication followed by two divisions, reducing chromosome number in the normal life-cycle context.
Homologous chromosomes pair and can exchange segments during prophase I; homologues separate in meiosis I, while sister chromatids normally separate in meiosis II.
Independent assortment and recombination contribute variation. Meiosis is not simply two mitotic divisions with identical pairing behaviour.
