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The Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

Cellular Differentiation

Cellular Differentiation

How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Evolution of New Traits in Microbes

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Cell Diversity

Cell Diversity

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Synteny and Evolution

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Updated: Apr 11, 2026

A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro

A Simplified System for Evaluating Cell Mechanosensing and Durotaxis In Vitro

Published on: August 27, 2015

The cell as the mechanistic basis for evolution.

¹Department of Pediatrics, Harbor-UCLA Medical Center, Torrance, CA, USA.

Wiley Interdisciplinary Reviews. Systems Biology and Medicine

|May 28, 2015

Summary

Physiology

Area of Science:

Evolutionary Biology
Cell Biology
Physiology

Background:

Physiology's fundamental principles originate from the unicellular state.
Understanding physiology as a continuum from unicellular to multicellular life offers insights into development and evolutionary history.
Physiological mechanisms are most apparent during stress, exemplified by molecular pathways supporting the vertebrate water-land transition and lung evolution.

Purpose of the Study:

To explore the implications of viewing evolution through the lens of unicellular origins.
To demonstrate how reducing evolution to cell biology enhances predictive power.
To reveal causal genotype-phenotype relationships and clarify counter-intuitive physiological and medical phenomena.

Main Methods:

Analyzing evolutionary development as a cyclical, epigenetic process.

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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

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Examining physiological mechanisms from unicellular origins to multicellular complexity.

Investigating the role of the unicellular state as the primary object of selection.

Main Results:

The unicellular state is likely the primary target of evolutionary selection.
Viewing evolution from unicellular origins clarifies genotype-phenotype relationships.
This perspective explains previously anecdotal or counter-intuitive physiological and medical observations.

Conclusions:

Evolutionary development is a reiterative environmental assessment process originating from unicellular homeostasis.
Understanding unicellular origins provides a predictive framework for physiology and medicine.
The continuum from unicellular to multicellular life is key to understanding physiological adaptation and evolution.