Speciation (AQA GCSE Biology): Flashcards
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Define speciation
Define speciation
Process where new species arise through selection of different alleles
Outcome of speciation
Outcome of speciation
Populations can't interbreed to produce fertile offspring
Alfred Russel Wallace's role
Alfred Russel Wallace's role
Co-developer of evolution by natural selection theory
Wallace's observation on survival
Wallace's observation on survival
Individuals lacking beneficial traits more likely to die out
Wallace's work on animal adaptation
Wallace's work on animal adaptation
Warning coloration in animals
Year 'On the Origin of Species' published
Year 'On the Origin of Species' published
1859
First step in speciation process
First step in speciation process
Genetic variation exists within a population
Role of natural selection in speciation
Role of natural selection in speciation
Alleles with survival advantage become more common
Cause of isolation in speciation
Cause of isolation in speciation
Physical barriers e.g. mountains or rivers
Define divergent evolution
Define divergent evolution
Different alleles selected in new environment
Define genetic divergence
Define genetic divergence
Accumulation of genetic differences between populations
Final step marking new species
Final step marking new species
Reproductive isolation - can't interbreed for fertile offspring