Biology › Section J · Evolution › Topic J.2
Formation of new species
Speciation is how one species splits into two. It begins when populations stop exchanging genes and ends when they can no longer interbreed at all.
In this topic
- How one species becomes two
- What counts as a species
- Speciation is a branching event
- Prezygotic barriers
- Postzygotic barriers
- Allopatric speciation
- Worked example: Reading an allopatric split
- Sympatric speciation
- Worked example: Checking chromosome counts
- Adaptive radiation
- Common mistakes to avoid
- Key takeaways
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