6.3.2: Speciation (biology only)
Not started yet — this one needs some love.
Alfred Russel Wallace independently proposed the theory of evolution by natural selection.
Wallace published joint writings with Darwin in 1858, prompting Darwin to publish On the Origin of Species in 1859.
Wallace worked worldwide gathering evidence for evolutionary theory.
Wallace is best known for his work on warning colouration in animals and his theory of speciation.
Alfred Wallace did much pioneering work on speciation.
More evidence over time has led to our current understanding of the theory of speciation.
Speciation can happen when populations of one species become so different that they can no longer interbreed to produce fertile offspring.
Speciation example: two isolated populations experience different selection pressures, so different phenotypes become common over many generations.
Common exam mistakes
Speciation requires populations to become unable to interbreed to produce fertile offspring.
Populations looking different is not enough on its own; reproductive isolation is the key end point.
Wallace independently proposed evolution by natural selection, so do not credit only Darwin for the idea.
Wallace is linked with warning colouration in animals and the theory of speciation.
When explaining speciation, include isolation, different selection pressures, and accumulation of genetic differences.