Homeschool Guide: These lesson plans are a guide for parents. Content may contain errors — always cross-reference with official exam board specifications.

B38: Investigating Selective Breeding

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4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.

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Lesson Overview

Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, CCEA

Learning Objectives

Prerequisites

Materials & Equipment

Lesson 1: Introduction: Investigating Selective Breeding

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

3 quick questions to activate prior knowledge about investigating selective breeding. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for b38.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Investigating Selective Breeding. Goal: deliver a b38 lesson confidently, addressing the key concepts and common misconceptions. Connects to B37 development of understanding genetics evolution because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Investigating Selective Breeding is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect b38 to a real-world situation students recognise..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: A standard exam question on b38.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about b38 from your revision notes.
  3. Apply: Work through the b38 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on b38.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next — chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on b38.
Worked Example 3: Data/Application

Q: Interpret the data in the context of b38.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using investigating selective breeding
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of b38 work this way?"
A: Analogy: "a comparison that makes b38 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Investigating Selective Breeding in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: An exam question on b38 - AQA style]

  • 1 mark: key terminology
  • 1 mark: mechanism/process
  • 1 mark: application/example
  • 1 mark: evaluation - higher

Model response: "complete answer with expected detail/terminology"

Why full marks: what makes this strong

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to B37 development of understanding genetics evolution / B39 classification
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on investigating selective breeding, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 2: Core Concepts: Investigating Selective Breeding

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on investigating selective breeding. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for b38.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Investigating Selective Breeding. Goal: deliver a b38 lesson confidently, addressing the key concepts and common misconceptions. Connects to B37 development of understanding genetics evolution because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Investigating Selective Breeding is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect b38 to a real-world situation students recognise..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: A standard exam question on b38.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about b38 from your revision notes.
  3. Apply: Work through the b38 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on b38.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next — chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on b38.
Worked Example 3: Data/Application

Q: Interpret the data in the context of b38.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using investigating selective breeding
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of b38 work this way?"
A: Analogy: "a comparison that makes b38 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Investigating Selective Breeding in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: An exam question on b38 - AQA style]

  • 1 mark: key terminology
  • 1 mark: mechanism/process
  • 1 mark: application/example
  • 1 mark: evaluation - higher

Model response: "complete answer with expected detail/terminology"

Why full marks: what makes this strong

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to B37 development of understanding genetics evolution / B39 classification
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on investigating selective breeding, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 3: Application: Investigating Selective Breeding

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on investigating selective breeding. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for b38.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Investigating Selective Breeding. Goal: deliver a b38 lesson confidently, addressing the key concepts and common misconceptions. Connects to B37 development of understanding genetics evolution because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Investigating Selective Breeding is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect b38 to a real-world situation students recognise..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: A standard exam question on b38.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about b38 from your revision notes.
  3. Apply: Work through the b38 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on b38.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next — chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on b38.
Worked Example 3: Data/Application

Q: Interpret the data in the context of b38.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using investigating selective breeding
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of b38 work this way?"
A: Analogy: "a comparison that makes b38 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Investigating Selective Breeding in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: An exam question on b38 - AQA style]

  • 1 mark: key terminology
  • 1 mark: mechanism/process
  • 1 mark: application/example
  • 1 mark: evaluation - higher

Model response: "complete answer with expected detail/terminology"

Why full marks: what makes this strong

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to B37 development of understanding genetics evolution / B39 classification
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on investigating selective breeding, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

Lesson 4: Exam Practice: Investigating Selective Breeding

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on investigating selective breeding. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for b38.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Investigating Selective Breeding. Goal: deliver a b38 lesson confidently, addressing the key concepts and common misconceptions. Connects to B37 development of understanding genetics evolution because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Investigating Selective Breeding is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect b38 to a real-world situation students recognise..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: A standard exam question on b38.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about b38 from your revision notes.
  3. Apply: Work through the b38 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on b38.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next — chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on b38.
Worked Example 3: Data/Application

Q: Interpret the data in the context of b38.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using investigating selective breeding
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of b38 work this way?"
A: Analogy: "a comparison that makes b38 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Investigating Selective Breeding in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: An exam question on b38 - AQA style]

  • 1 mark: key terminology
  • 1 mark: mechanism/process
  • 1 mark: application/example
  • 1 mark: evaluation - higher

Model response: "complete answer with expected detail/terminology"

Why full marks: what makes this strong

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to B37 development of understanding genetics evolution / B39 classification
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on investigating selective breeding, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

📝 Mark Scheme Guidance

How examiners mark B38: Read the command word carefully — State = one word/phrase (1 mark), Describe = pattern or detail (2 marks), Explain = reason with "because" (2–3 marks), Compare = similarities AND differences, Evaluate = both sides + conclusion. Method marks are awarded for correct working even if the final answer is wrong. Always show your working — unexplained answers score zero for AO2.

Success on B38 questions: Underline the command word, count the marks (one mark per point expected), and answer in the format the command word demands.

Board Notes & Revision Links

This lesson is examined by: AQA 8461 | Edexcel 1BI0 | OCR J247 | CCEA units. Tier and paper details vary - always check your board's current specification.

Follow-up revision: all biology topics on GCSE Revise (notes, flashcards and auto-graded target tests for this exact topic).

📐 Reference Diagram

B b B b BB Bb Bb bb B = dominant (brown eyes) b = recessive (blue eyes) Ratio: 3 brown : 1 blue

✏️ Draw-Along Instructions

Parent/teacher: Draw a 2×2 grid. Put one parent’s alleles across the top (B, b). Put the other parent’s alleles down the side. Fill each box by combining the row and column letters. Count the ratio of outcomes.

Display the reference diagram (or draw it live) while pupils copy. Check each label as it is added.

Homework & Consolidation

Recommended Resources

🎓 Smart Lesson (Guided)