AQA GCSE Biology · 8461
Specification 4.6.3.2 · Paper 2
Revise: SpeciationOnce the populations cannot interbreed to produce fertile offspring, reproductive isolation has occurred and separate species have formed.
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GCSE Biology · key term
The separation of populations so that they do not interbreed and exchange alleles.
Used by AQA
Specification 4.6.3.2 · Paper 2
Revise: SpeciationOnce the populations cannot interbreed to produce fertile offspring, reproductive isolation has occurred and separate species have formed.
For a speciation question, give the whole sequence: variation → isolation → different selection pressures → different alleles become more common → populations become genetically different → they can no longer interbreed to produce fertile offspring.
The defining final test for the formation of separate species is reproductive isolation: the populations cannot interbreed to produce fertile offspring.
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