Selective Breeding and Gene Technology
Comparing human selection and genome modification and evaluating agricultural, medical, ecological and ethical consequences.
How to study for GCSE Combined Science
Build the three sciences as connected disciplines, practise mathematical and practical reasoning, then apply the common core to the exact tier and paper structure of your current specification.
Core concepts
Concept 1
Selective breeding chooses parents with desired phenotypes over generations but can reduce genetic diversity.
Exam cue: Distinguish selecting existing alleles from directly modifying genetic material.
Concept 2
Genetic engineering modifies a genome to introduce a desired characteristic through a defined sequence of laboratory steps.
Exam cue: Evaluate a named application with benefit, risk, uncertainty and affected groups.
Concept 3
Decisions require evidence about effectiveness, inheritance, off-target effects, ecosystems, food security and ethical values.
Targeted study blocks
Tier coverage
Foundation core with Higher-tier extensions
Higher-tier work can require greater procedural detail and evaluation of indirect, long-term and population-level consequences.
Risk pitfalls and guardrails
Calling all modern crop breeding genetic engineering.
Guardrail: Do not import separate-science content or another route's paper order; use the full physics equations sheet required for current specifications while checking the exact series materials and entered tier.
Presenting possible harm as certain or absence of evidence as proof of safety.
Guardrail: Do not import separate-science content or another route's paper order; use the full physics equations sheet required for current specifications while checking the exact series materials and entered tier.
Memory anchors
Selective breeding
Human selection of parents to increase desired inherited features over generations.
Genetic engineering
Direct modification of an organism's genome to introduce desired characteristics.
Genetic diversity
The range of alleles present within a population.
Risk-benefit evaluation
A judgement weighing likely gains, harms, uncertainty and alternatives.
Gene-technology ethics
Reasoning about values, rights and consequences beyond measured biological effects.
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
What is the first key choice in selective breeding?
Why can selective breeding reduce genetic diversity?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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