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IB Biology Topic D4.1 Natural Selection (SL/HL) covers syllabus content as part of Topic D4: Ecosystems under Theme D: Continuity and Change. Use these Notes, Questionbank, Videos, Flashcards, and Lessons to review the topic, practise exam questions, and move between notes, videos, flashcards, and lessons where available.
D4.1.1 Natural selection as the mechanism driving evolutionary change
D4.1.2 Roles of mutation and sexual reproduction
D4.1.3 Overproduction of offspring and competition for resources
D4.1.4 Abiotic factors as selection pressures
D4.1.5 Differences between individuals in adaptation, survival and reproduction
D4.1.6 Requirement that traits are heritable for evolutionary change to occur
D4.1.7 Sexual selection as a selection pressure in animal species
D4.1.8 Modelling of sexual and natural selection
D4.1.9 Concept of the gene pool (HL)
D4.1.10 Allele frequencies of geographically isolated populations (HL)
D4.1.11 Changes in allele frequency in the gene pool (HL)
D4.1.12 Differences between directional, disruptive and stabilizing selection (HL)
D4.1.13 Hardy–Weinberg equation and calculations of allele or genotype frequencies (HL)
D4.1.14 Hardy–Weinberg conditions (HL)
D4.1.15 Artificial selection by deliberate choice of traits (HL)
