This complete master revision guide covers D1.1 DNA Replication for IB Biology. Designed for both Standard Level and Higher Level students.

What’s inside?

Complete syllabus coverage – All 9 syllabus points (D1.1.1 to D1.1.9) with clear explanations and mechanisms. HL content clearly marked.

Priority heatmap – Exam frequency ratings for every syllabus point. Focus revision where it matters most. Semi-conservative replication, helicase/DNA polymerase roles, PCR, and gel electrophoresis appear in almost every session.

NOS connections – Isotopic labelling in the Meselson-Stahl experiment as a model for falsifying competing hypotheses. Probability and DNA profiling – more STR markers reduce false match probability.

TOK connections – “How is genetic continuity ensured between generations?” (semi-conservative replication, proofreading, cell division). “What biological mechanisms rely on directionality?” (5’→3’ DNA synthesis, leading vs lagging strands, central dogma).

IA sparks – Three IA ideas: effect of annealing temperature on PCR product yield, gel electrophoresis optimisation (agarose concentration), bioinformatics sequence divergence analysis (cytochrome c gene).

Linking questions – Official IB linking questions connecting D1.1 to A1.2 (DNA structure), D1.2 (transcription), D2.1 (cell division), D1.3 (mutation), and A2.3 (retroviruses).

Worked exam question – Weak answer vs strong answer with examiner commentary for explaining lagging strand synthesis (4 marks, HL).

Predicted exam questions – Likely Paper 1 and Paper 2 questions with mark scheme guidance: semi-conservative replication, helicase/DNA polymerase roles, Taq polymerase in PCR, DNA ligase and primase functions (HL).

Knowledge checklist – Self-audit every syllabus point from replication purpose (D1.1.1) to DNA proofreading (D1.1.9 HL).

Colour-coded callouts – MUST-KNOW facts, COMMON exam traps, EXAMINER TIPS, HL-only content, and NOS/TOK/IA/LQ callouts.

Key features: Priority heatmap, required examples (Meselson-Stahl, Taq polymerase, STR profiling, CODIS markers), command word guide, cross-topic links table, confidence self-rating grid.

Perfect for: Exam revision, high-yield topic review (semi-conservative replication, PCR, gel electrophoresis), understanding where marks are lost. HL students needing directionality, leading/lagging strands, Okazaki fragments, proofreading, and the four prokaryotic replication enzymes.

For complete Theme D Continuity and Change revision guides, please visit /teaching-resource/-13484724

Tags:
#IBBiology #D1_1 #DNAReplication #SemiConservative #MeselsonStahl #Helicase #DNAPolymerase #PCR #TaqPolymerase #GelElectrophoresis #DNAProfiling #OkazakiFragments #Proofreading #IBRevision #DPBiology #SL #HL #NOS #TOK