A growing number of evolutionary biologists, including Kevin Laland, are challenging the modern synthesis that has dominated the field since the mid-20th century. They advocate for an Extended Evolutionary Synthesis (EES), which argues that developmental processes and epigenetic inheritance play more significant roles in evolution than previously acknowledged. This debate pits established authorities against proponents of these new ideas.

The orthodox view holds that natural selection acting on genetic mutations fully explains adaptation. However, studies like mice inheriting learned fears and worms passing on viral defenses suggest otherwise. These findings indicate that experiences can leave epigenetic marks on genes, which sometimes escape being reset and are passed to offspring, challenging the long-held dismissal of Lamarckian-like mechanisms.

The push for an EES isn't just academic; it reflects a broader shift in understanding biological complexity. Philosophers of science argue that scientific change is messier than simple revolutions, often involving protective tweaks to core theories. The outcome of this debate will shape how we explain everything from human culture to speciation, as seen in orcas diversifying their diets.