Final answer:
Gradual evolution is the component of speciation least likely to be part of punctuated equilibrium which is characterized by rapid changes and long periods of stasis rather than continuous slow change.
Step-by-step explanation:
The concept most unlikely to be associated with punctuated equilibrium is gradual evolution. Punctuated equilibrium proposes that species experience long periods of stasis, or little to no change, interrupted by rapid changes in morphology due to sudden environmental shifts, such as climate changes. These rapid changes can result in the divergence and formation of new species.
On the other hand, gradual evolution—referenced in gradual speciation—occurs at a slow and steady pace, with species diverging as traits change incrementally over time. This is contrasted by the fossil record's evidence of punctuated equilibrium, which often displays static populations punctuated by sharp, substantial morphological changes, rather than a continuous, slow change. Therefore, gradual evolution doesn't align well with the concept of punctuated equilibrium and would be less likely to be observed in species that undergo this type of speciation.