BRAINCAKEAllopatric Speciation
Allopatric speciation occurs when a physical barrier arises between members of a population. The two new populations become geographically isolated in different environments by, for example, a mountain, river or the sea.
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Key terms in this lesson
- mutation
- A random change in the base sequence of DNA (a gene mutation) or in the structure or number of chromosomes (a chromosome mutation).
- speciation
- The evolution of a new species from an existing one, usually as a result of reproductive isolation between populations.
More in Genetics and Variation
- Epistasis
- The Hardy-Weinberg Principle
- Changes in Allele Frequencies
- Population Bottlenecks and The Founder Effect
- Types of Selection
- Species
- Sympatric Speciation
- Artificial Selection
All 36 lessons in Genetics and Variation · All AQA A-level Biology topics