Mutationism and the dual causation of evolutionary change

Area of Science:

• Evolutionary biology
• Genetics
• Developmental biology

Background:

• The rediscovery of Mendel's laws established genetics, leading to a mutationist view of evolution.
• The Modern Synthesis redefined evolution as shifting gene frequencies, downplaying mutation's creative role.
• Mutationist ideas, focusing on mutation and altered development, have re-emerged in evolutionary science.

Purpose of the Study:

• To challenge the prevailing Modern Synthesis view of evolution.
• To re-evaluate the role of mutation and altered development in evolutionary change.
• To propose a new understanding of dual causation in evolution.

Main Methods:

• Historical analysis of evolutionary thought.
• Review of molecular evolution and evolutionary developmental biology findings.
• Theoretical synthesis of genetic and developmental factors in evolution.

Main Results:

• Mutationist ideas, initially clashing with Darwinian and Modern Synthesis views, offer insights into evolutionary creativity and directionality.
• Recent research in molecular evolution and evolutionary developmental biology supports the significance of mutation and altered development.
• These concepts are increasingly recognized for their role in adaptive dynamics and evolutionary change.

Conclusions:

• Integrating mutation and altered development into evolutionary theory is crucial for a more comprehensive and predictive understanding.
• A new research program is needed to emphasize the emergence of variation as a driver of evolutionary change.
• This synthesis acknowledges the dual causation of evolution, incorporating both selection and variation emergence.