Neurological and developmental differences lead to directional selection and changes in the set of foraging behaviors between generations of honey bees.
If pollinators selectively visit a particular morph, this will cause this morph to increase in frequency, and may ultimately lead to the fixation of this phenotype, known as directional selection.
Because the main cause for directional selection is different and changing environmental pressures, rapidly changing environments, such as climate change, can cause drastic changes within populations.
Under directional selection, the advantageous allele increases as a consequence of differences in survival and reproduction among different phenotypes.