Introduction to Genetics

Overview

This is Lesson 1 of 13 in the unit Manipulating Genetics and Evolution designed for Year 13 students. This 60-minute lesson introduces foundational concepts of genetics, including DNA structure, gene expression basics, and patterns of inheritance. Students will develop science understanding aligned with the New Zealand Curriculum (NZC) and deepen their scientific literacy.

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Learning Objectives

By the end of the lesson, students will be able to:

• Explain key genetic terms such as DNA, gene, chromosome, allele, and genotype.
• Describe the basic structure of DNA and its role in inheritance.
• Understand and explain simple inheritance patterns (dominant/recessive).
• Develop familiarity with gene expression as the process from DNA to trait manifestation.

NZ Curriculum Alignment:

• Achievement Standard: AS91603 (1.2) - Demonstrate understanding of how traits are passed on through generations (Level 3 Science)
• Strands:
• Nature of Science (Investigating, interpreting, and communicating scientifically)
• Living World (Structure and function, genetics and inheritance)
• Key Competencies:
• Thinking (analysing and using evidence)
• Managing Self (self-motivation and focus during learning)
• Using Language, Symbols, and Text (scientific terminology and diagrams)

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Success Criteria

Students can:

• Define and explain genetic terms and concepts clearly.
• Identify and describe the structure of DNA using diagrams.
• Outline basic inheritance patterns using Punnett squares.
• Engage with and communicate genetic ideas using appropriate science language.

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Resources and Materials

• Visual aids: DNA double helix model, diagrams of chromosomes, Punnett square templates
• Simplified glossary sheets for genetic terms
• Whiteboard and markers
• Projector for slides illustrating DNA, gene expression, and inheritance
• Worksheets with guided questions and Punnett square exercises
• Extension reading material summarising recent advances in genetics (printed)

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Lesson Structure and Timing

1. Starter / Engagement (10 minutes)

• Begin with a brief quiz or brainstorm: What do you already know about genetics?
• Present key vocabulary using a visual glossary projected on screen and handed out as a simplified sheet — words like DNA, gene, allele, genotype, phenotype, chromosome.

Differentiation: Use colour coding and images on glossary sheets for struggling learners.

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2. Direct Teaching / Input (15 minutes)

• Present a concise explanation of DNA structure using a 3D model and diagrams to highlight base pairs and the double helix structure.
• Explain gene expression basics: how genes encode proteins that influence traits.
• Introduce simple inheritance patterns — dominant vs recessive alleles — supported by classic examples (e.g., pea plant flower colour, human earlobe attachment).

Visual Aids: Step-by-step slide animation showing DNA → RNA → Protein (simplified).

Differentiation: Use clear, simple language with visuals for learners needing extra support.

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3. Guided Practice (15 minutes)

• Use Punnett squares to model simple monohybrid crosses.
• Students work in pairs to complete 2-3 Punnett square problems on worksheet.
• Teacher circulates to support and scaffold as needed.

Success Check: Ask a few pairs to explain their results to the class briefly.

Differentiation: Provide partially completed Punnett squares to those who struggle.

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4. Independent or Group Extension Activity (10 minutes)

• Students interested in extension research one recent advance in genetic science (e.g., CRISPR gene editing, gene therapy breakthroughs) using preset printed summaries.
• These students prepare a one-minute explanation to share in a future lesson.

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5. Lesson Review & Reflection (10 minutes)

• Recap core concepts orally and with quick Q&A.
• Exit ticket: Students write down one key idea they learned and one question they still have about genetics.
• Collect exit tickets to inform planning for next lesson.

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Differentiation Strategies

• Visual aids and simplified glossary support vocabulary acquisition.
• Stepwise scaffolding during Punnett square work.
• Peer collaboration to support struggling learners.
• Extension tasks provide challenge for advanced students.

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Assessment and Feedback

• Formative assessment through class participation, worksheet completion, and exit tickets.
• Feedback given immediately during activities and at review.
• Informal questioning to gauge conceptual understanding.

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Reflection and Next Steps

• Use students’ exit ticket questions to guide Lesson 2 planning.
• Next lesson will deepen understanding by exploring mutation and genetic variation.

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This lesson is designed to engage Year 13 boys in a straightforward manner that builds confidence and understanding while supporting diverse learners. It complies with the New Zealand Curriculum’s focus on robust science knowledge and key competence development, setting the foundation for further genetic study in the unit.