Trypsin and chymotrypsin are an example of divergent evolution.Divergent evolution is the accumulation of differences between groups which can lead to the formation of new species.All are derived from a common ancestral serine protease, and are described as homologous.They have very strong structural similarity.They use the same mechanism for the cleavage of protein chains.Some non-mammalian serine proteases have 20-50% sequence identity with mammalian ones, suggesting a common ancestral protease. Solution Trypsin and chymotrypsin are an example of divergent evolution.Divergent evolution is the accumulation of differences between groups which can lead to the formation of new species.All are derived from a common ancestral serine protease, and are described as homologous.They have very strong structural similarity.They use the same mechanism for the cleavage of protein chains.Some non-mammalian serine proteases have 20-50% sequence identity with mammalian ones, suggesting a common ancestral protease..