Evolution and Speciation
Genomic variation, natural selection, selection patterns, horizontal gene transfer, isolation, allopatric and sympatric speciation.
How to study Higher Biology
Move from accurate biological mechanisms to unfamiliar data, experimental evidence and justified conclusions. Use current official materials for the written, extended-response and controlled-assignment formats that this question bank does not reproduce.
Core concepts
Concept 1
Use differential survival and reproduction to explain non-random changes in sequence frequency.
Exam cue: Use differential survival and reproduction to explain non-random changes in sequence frequency.
Concept 2
Recognise stabilising, directional and disruptive changes in phenotype distributions.
Exam cue: Recognise stabilising, directional and disruptive changes in phenotype distributions.
Concept 3
Link isolation, mutation and selection to reduced gene flow and the formation of new species.
Exam cue: Link isolation, mutation and selection to reduced gene flow and the formation of new species.
Risk pitfalls and guardrails
Mutations arise randomly with respect to need; selection is non-random.
Guardrail: Check vocabulary, sequence, direction, compartment, units and whether the evidence supports causation or only an association.
Geographical isolation supports allopatric, not sympatric, speciation.
Guardrail: Check vocabulary, sequence, direction, compartment, units and whether the evidence supports causation or only an association.
Memory anchors
Speciation sequence
Isolation → variation → selection → divergence.
Selection shapes
Stabilising centres, directional shifts, disruptive splits.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
How is evolution defined in the Higher Biology course?
Why is natural selection described as non-random?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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