Selective Breeding — GCSE Biology Revision
Revise Selective Breeding for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Genetic EngineeringWhat is Selective Breeding?
Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics. Humans select individuals with the desired traits and breed them together over many generations to produce offspring with enhanced characteristics, such as disease resistance in crops or gentle temperament in dogs.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The process, benefits, and risks (especially inbreeding) are all key areas.
Step-by-step explanationWorked example
To produce a cow that yields a high volume of milk, a farmer would select a bull and a cow from their herd that have the characteristic of high milk production. They would breed these two individuals together. From the offspring, they would again select those with the highest milk yield and breed them. Repeating this process over several generations will lead to a herd of cows with a much higher average milk yield.
Mini lesson for Selective Breeding
1. Understand the core idea
Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics. Humans select individuals with the desired traits and breed them together over many generations to produce offspring with enhanced characteristics, such as disease r...
Can you explain Selective Breeding without copying the notes?
2. Turn it into marks
To produce a cow that yields a high volume of milk, a farmer would select a bull and a cow from their herd that have the characteristic of high milk production. They would breed these two individuals together.
Underline the method, evidence, or command-word move that would earn credit in GCSE Inheritance, Variation & Evolution.
3. Fix the likely mark leak
Watch for this mistake: Confusing selective breeding with genetic engineering. Selective breeding works with the existing genetic variation within a species, while genetic engineering involves directly altering an organism's DNA, sometimes by introducing genes from another species.
Write one correction rule before doing another practice question.
Practise this topic
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Selective Breeding practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Selective Breeding is testing.
Answer: Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics. Humans select individuals with the desired traits and breed them together over many generations to produce offspring with enhanced characteristic...
Mark focus: Precise definition and topic focus.
Question 2
A Selective Breeding question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing selective breeding with genetic engineering. Selective breeding works with the existing genetic variation within a species, while genetic engineering involves directly altering an organism's DNA, sometimes by introducing genes from another species." What should their next repair task be?
Answer: Do one Selective Breeding question and review the mistake type.
Mark focus: Error correction and next-step practice.
Selective Breeding flashcards
Core idea
What is the main idea in Selective Breeding?
Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics. Humans select individuals with the desired traits and breed them...
Common mistake
What mistake should you avoid in Selective Breeding?
Confusing selective breeding with genetic engineering. Selective breeding works with the existing genetic variation within a species, while genetic engineering involves directly altering an organism's DNA, sometimes b...
Practice
What is one useful practice task for Selective Breeding?
Answer one Selective Breeding question and review the mistake type.
Exam board
How should you use board notes for Selective Breeding?
Covered by all major boards (AQA, Edexcel, OCR). The process, benefits, and risks (especially inbreeding) are all key areas.
Common mistakes
- 1Confusing selective breeding with genetic engineering. Selective breeding works with the existing genetic variation within a species, while genetic engineering involves directly altering an organism's DNA, sometimes by introducing genes from another species.
- 2Thinking it is a fast process. Selective breeding takes many generations to achieve the desired outcome, often spanning many years or decades.
- 3Ignoring the downsides. Inbreeding, a consequence of selective breeding, can lead to a reduction in the gene pool and an increased chance of individuals inheriting genetic defects and being prone to specific diseases.
Selective Breeding exam questions
Exam-style questions for Selective Breeding with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Selective Breeding
Core concept
Selective breeding, also known as artificial selection, is the process by which humans breed plants and animals for particular genetic characteristics. Humans select individuals with the desired trait…
Frequently asked questions
What is the main purpose of selective breeding?
The main purpose is to develop organisms with features that are useful or desirable to humans. This includes increasing food production (e.g., high-yield wheat), creating docile domestic animals, or producing flowers with unusual colours.
What are the risks of selective breeding?
The main risk is inbreeding, which reduces genetic diversity. This can make populations more susceptible to new diseases and can lead to an accumulation of harmful recessive alleles, causing health problems.