Approaches to Macroevolution: 1. General Concepts and Origin of Variation

Area of Science:

• Evolutionary biology
• Developmental biology
• Genetics

Background:

• Macroevolutionary studies require integrating variation's origin and sorting.
• Macroevolutionary currencies include taxonomic diversity, morphological disparity, and functional variety.

Purpose of the Study:

• To explore the developmental basis of macroevolution.
• To understand how gene regulatory networks (GRNs) and developmental plasticity influence macroevolutionary patterns.
• To re-evaluate macroevolutionary models in light of developmental factors.

Main Methods:

• Conceptual synthesis of developmental genetics, epigenetics, and evolutionary theory.
• Analysis of macroevolutionary patterns through a hierarchical framework.
• Examination of factors influencing evolutionary novelty and diversification.

Main Results:

• Developmental factors, including gene regulatory networks (GRNs) and plasticity, shape macroevolutionary trajectories.
• Evolutionary change exhibits anisotropic probabilities, influenced by developmental constraints and epigenetic mechanisms.
• Macroevolutionary lags and the origins of novelty are complex, influenced by contingency and synergistic interactions.

Conclusions:

• Macroevolutionary theory needs to incorporate developmental mechanisms for a comprehensive understanding.
• Standard microevolutionary models require modification to account for developmental influences.
• A general model linking development, genetics, and ecology is crucial for explaining macroevolutionary patterns.