Speciation (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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Define speciation
Define speciation
Process where new species arise through selection of different alleles
What does speciation lead to initially
What does speciation lead to initially
Increased genetic variation
End result of speciation
End result of speciation
Populations can't interbreed to produce fertile offspring
Who was Alfred Russel Wallace
Who was Alfred Russel Wallace
Co-developed theory of evolution by natural selection
Who did Wallace collaborate with
Who did Wallace collaborate with
Darwin - published joint studies on natural selection
Year 'On the Origin of Species' published
Year 'On the Origin of Species' published
1859
Wallace's contribution on animal coloration
Wallace's contribution on animal coloration
Warning coloration in animals
Step 1 of speciation
Step 1 of speciation
Genetic Variation - variation exists within population
Step 2 of speciation
Step 2 of speciation
Natural Selection - advantageous alleles selected for
Step 3 of speciation
Step 3 of speciation
Isolation - population isolated, can't breed with original
Examples of physical barriers causing isolation
Examples of physical barriers causing isolation
Mountains or rivers
Step 4 of speciation
Step 4 of speciation
Divergent Evolution - different alleles advantageous in new environment
Step 5 of speciation
Step 5 of speciation
Genetic Divergence - accumulation of genetic differences
Step 6 of speciation
Step 6 of speciation
Reproductive Isolation - can't interbreed for fertile offspring