The idea of constancy in development and evolution - Scientific and philosophical perspectives

Area of Science:

• Developmental Biology
• Evolutionary Biology
• Philosophy of Science

Background:

• Organisms display consistent phenotypes across diverse environments and species remain stable over long periods.
• Explaining stable biological change requires understanding the basis of this constancy.
• Existing models often rely on genetic factors, mathematical-chemical approaches, or a combination.

Purpose of the Study:

• To argue that constancy in development and species stability are prerequisites for explaining stable evolutionary change.
• To evaluate the explanatory power of genetic and mathematical-physical-chemical models for biological constancy.
• To explore historical parallels in philosophical attempts to reconcile constancy and change.

Main Methods:

• Conceptual analysis of biological constancy and change.
• Critique of mathematical-physical-chemical models in explaining biological stability.
• Integration of genome-based mechanisms with physical-chemical processes.
• Historical comparison with ancient Greek philosophical concepts.

Main Results:

• Organismal constancy is linked to structural hierarchies, especially gene-regulatory networks and genetic causality.
• Purely mathematical-physical-chemical models inadequately explain biological constancy.
• Integrating genome-based and physical-chemical mechanisms shows promise for explaining specific developmental patterns.
• Ancient Greek philosophy explored similar tensions between constancy and change.

Conclusions:

• Stable evolutionary change is best understood by first explaining biological constancy.
• Gene-regulatory networks and genetic causality are fundamental to biological stability.
• A synthesis of genetic and physical-chemical approaches offers a more complete explanation for developmental and evolutionary stability.