Genetic Crosses and Sickle Cell Genotypes — Interactive Lesson (Ages 14–16)

AA, AS or SS? Teach pupils to predict what children can inherit — and why genotype testing matters. This 22-slide interactive lesson on genetic crosses takes pupils from first ideas to exam-style explanations, with 13 self-marking activities and nothing to prepare beforehand.

Teaching Genetic Crosses and Sickle Cell Genotypes in GCSE Biology

Pupils recap alleles, genotype, phenotype, homozygous and heterozygous, then apply them to the sickle cell genotypes AA, AS and SS. They draw Punnett squares for carrier crosses such as AS × AS, express outcomes as probabilities, percentages and ratios, and compare sickle cell with cystic fibrosis. The lesson finishes with sex determination using X and Y chromosomes and a reveal on why the AS genotype is common where malaria is widespread.

What Pupils Will Learn

• Use the terms allele, genotype, phenotype, homozygous and heterozygous correctly.
• Explain the genotypes AA, AS and SS for sickle cell.
• Draw Punnett squares to predict the outcomes of genetic crosses.
• Express outcomes as probabilities, percentages and ratios.
• Explain how sex is determined by the X and Y chromosomes.

What’s Included

• 22-slide interactive lesson
• 13 self-marking activities: multiple-choice questions, true-or-false checks, sorting tasks, drag-and-drop categorising 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 UK GCSE Biology and Combined Science (AQA, Edexcel and OCR) and the Nigerian Senior Secondary Biology curriculum (SS3), including WAEC and NECO exam preparation.

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FAQ

What year groups is this for? Years 10–11 (ages 14–16), and SS3 in Nigeria.

Is it self-marking? Yes — all 13 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.