3B.5 Fertilisation in Mammals

Pearson Edexcel International A Level Biology Teaching Resource (WBI12)

• Designed for: Pearson Edexcel International A Level Biology
• Covers: Unit 2: Cells, Development, Biodiversity and Conservation (WBI12)
• Aligned with specification point: 3B.5 – Fertilisation in Mammals

This teaching resource includes clear lesson slides, step-by-step reaction pathways, and student-friendly summaries covering every stage of mammalian fertilisation and the protective mechanisms preventing polyspermy.

Designed to support both teachers and students, this resource helps learners master the exact sequence of cellular events—from sperm-egg recognition and binding to the acrosome reaction, membrane fusion, the cortical reaction (zona hardening), and the restoration of a diploid zygote nucleus. Ideal for classroom teaching, revision, independent study, and exam preparation.

Includes:

• Step-by-step breakdown of the fertilisation sequence (Recognition → Acrosome Reaction → Fusion → Cortical Reaction)
• Detailed explanations of the mechanisms preventing polyspermy (zona pellucida cross-linking)
• High-yield annotated diagrams and pathway flowcharts
• Key vocabulary and exam-focused tips on mark scheme terminology
• Fully aligned Pearson Edexcel International A Level material

Perfect for: A Level Biology lessons, revision sessions, tutoring, homework support, and exam prep.