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IB Biology HL D3.1.15 Hl Preventing Polyspermy Questions

Explain how acrosome enzymes help sperm penetrate the zona pellucida, then how cortical granule release changes the zona to block polyspermy.

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.

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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