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IB Biology HL D3.1.15 Hl Preventing Polyspermy Questions

Trace acrosome penetration and cortical-granule changes that ensure only one sperm fertilizes the egg in IB Biology HL D3.1.15.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how acrosome enzymes digest the zona pellucida and allow one sperm to reach or penetrate the egg membrane.
  • Explain how cortical-granule release changes the zona pellucida or egg membrane to block polyspermy.
  • Sequence the acrosome reaction, sperm-egg fusion/penetration and cortical reaction during normal fertilization.

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Study D3.1.15 (HL)—Preventing polyspermy conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D3.1.15 Hl Preventing Polyspermy Questions question 1

[Maximum number: 2]

Hemophilia is a sex-linked disease that affected some members of royal families in Europe during the 19th and 20th centuries.

Figure for Question IB Biology HL D3.1.15 Hl Preventing Polyspermy Questions question 1 — IB Biology HL

Explain the mechanism that prevents polyspermy during fertilization.

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