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Animation(2 min 38 sec) This animation features the anole lizards as an example of how a single species can split and multiply into many different species with distinct traits.
Animation(29 sec) This "morph" animation demonstrates how the expression of a particular toolkit gene in a butterfly larva corresponds to the location of the wing eyespots in an adult butterfly.
Animation(5 min 39 sec) How did the human Y chromosome become so small relative to its X counterpart? This animation depicts the 300-million-year odyssey of the sex chromosomes that began when the proto X and Y were an identical pair.
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