Summary
The sperm penetrates the egg, triggering the cortical reaction that blocks other sperm.
In depth
Sperm travel through the cervix and uterus; only a few hundred reach the egg. Capacitation and acrosome reaction allow penetration; fusion triggers the cortical reaction. About 24 hours after fusion, pronuclei form.
The first sperm to fuse triggers blocks to polyspermy. Fertilisation restores diploid number and determines sex. Cleavage begins about 30 hours later.
Key idea: fertilisation combines the genetic material of two parents.
Frequently asked questions
What is Fertilisation Process?
The sperm penetrates the egg, triggering the cortical reaction that blocks other sperm.
Which area of biology covers Fertilisation Process, and how advanced is it?
Fertilisation Process is one of the 54 topics in Reproduction & Endocrinology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Sperm Capacitation and Acrosome Reaction, Sexual Reproduction, Zona Pellucida and Egg Activation.
Can you give an example of Fertilisation Process?
Fertilisation usually occurs in the ampulla of the fallopian tube.
What should I learn before Fertilisation Process?
Work through the Beginner topics in Reproduction & Endocrinology first, such as Reproduction, Asexual Reproduction, Sexual Reproduction, then return to Fertilisation Process. Intermediate topics assume the Beginner vocabulary.
What topics are related to Fertilisation Process?
The closest topics to Fertilisation Process are Sperm Capacitation and Acrosome Reaction, Sexual Reproduction, Zona Pellucida and Egg Activation, Infertility and IVF. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Fertilisation Process?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Fertilisation Process. To practise the whole of Reproduction & Endocrinology, use the Reproduction & Endocrinology quiz.
How is Fertilisation Process different from Sperm Capacitation and Acrosome Reaction?
Fertilisation Process: The sperm penetrates the egg, triggering the cortical reaction that blocks other sperm. Sperm Capacitation and Acrosome Reaction: Sperm undergo biochemical changes that let them penetrate the egg's protective layers. Read both side by side and note what each one explains.
How should I study Fertilisation Process step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Sperm Capacitation and Acrosome Reaction and explain the difference aloud. Finally, take the Reproduction & Endocrinology quiz and come back to this page for any question you miss.