DNA, Chromosomes and Variation — Interactive Lesson (Ages 11–14)

Why do children look like their families, but never exactly the same? This 17-slide interactive lesson on types of variation takes pupils from first ideas to exam-style explanations, with 9 self-marking activities and nothing to prepare beforehand.

Teaching DNA, Chromosomes and Variation in KS3 Science

Pupils describe how DNA, genes and chromosomes are related and how many chromosomes are in body cells and gametes. They learn how Franklin, Wilkins, Watson and Crick discovered the double helix, sort characteristics by genetic and environmental causes, tell continuous from discontinuous variation and choose a histogram or bar chart to display each.

What Pupils Will Learn

• Describe how DNA, genes and chromosomes are related.
• Describe how scientists discovered the structure of DNA.
• Explain genetic and environmental variation.
• Tell continuous and discontinuous variation apart.
• Choose the right graph to show each type of variation.

What’s Included

• 17-slide interactive lesson
• 9 self-marking activities: multiple-choice questions, true-or-false checks, sorting tasks and fill-in-the-gap questions
• Step-by-step teaching cards that reveal one point at a time
• A written explanation task with a model answer for self-assessment

Why Teachers Love It

• No prep — open it on an interactive whiteboard, laptop or tablet
• Instant feedback explains every answer, right or wrong
• Everyday examples make biology feel real
• Works for whole-class teaching, independent study or revision

Curriculum Alignment

Supports the UK Key Stage 3 Science curriculum and Nigerian Junior Secondary Basic Science (JSS3), building the foundations pupils need for GCSE, WAEC and NECO.

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FAQ

What year groups is this for? Year 9 (ages 11–14), and JSS3 in Nigeria.

Is it self-marking? Yes — all 9 activities give instant feedback.

Do pupils need to log in? No. The lesson runs in any modern web browser.

Can I use it for revision? Yes. Pupils can replay it as often as they like, and the results screen shows which questions to review before a test.