Abstract
Waddington's epigenetic landscape illustrates such characteristic features of development as homeorhesis and the existence of alternative developmental pathways. Simply recongnizing that these are typical allows us to make inferences about evolution, for example that macroevolution is often a different process from microevolution. We can account for the origin of these properties by assuming that many processes in development can be modelled by non-linear differential equatiions. The assumption then leads to two further predictions: that multiple speciation may be relatively common and that phenocopying is likely to occur in one direction only.
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