Anatomy & Physiology › Section Y · Reproduction and development › Topic Y.4
Fertilization
Fertilisation joins one sperm and one oocyte into a single cell with a full set of chromosomes. Getting there means surviving a hostile journey, being chemically primed, cutting through two protective layers and then shutting the door on every other sperm.
In this topic
- What fertilisation achieves
- A journey that thins the crowd
- How long each gamete survives
- Worked example: the length of the fertile window
- Capacitation: priming the sperm
- Crossing the corona radiata and zona pellucida
- Blocking extra sperm
- Worked example: counting chromosomes
- From pronuclei to zygote
- Twins and fertilisation outside the body
- Common mistakes to avoid
- Key takeaways
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