+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

The evolution of canalization and the breaking of von Baer's law: Modeling the evolution of development with epistasis

The evolution of canalization and the breaking of von Baer's law: Modeling the evolution of development with epistasis

Evolution 52(3): 647-656

Evolution can change the developmental processes underlying a character without changing the average expression of the character itself. This sort of change must occur in both the evolution of canalization, in which a character becomes increasingly buffered against genetic or developmental variation, and in the phenomenon of closely related species that show similar adult phenotypes but different underlying developmental patterns. To study such phenomena, I develop a model that follows evolution on a surface representing adult phenotype as a function of underlying developmental characters. A contour on such a "phenotype landscape" is a set of states of developmental characters that produce the same adult phenotype. Epistasis induces curvature of this surface, and degree of canalization is represented by the slope along a contour. I first discuss the geometric properties of phenotype landscapes, relating epistasis to canalization. I then impose a fitness function on the phenotype and model evolution of developmental characters as a function of the fitness function and the local geometry of the surface. This model shows how canalization evolves as a population approaches an optimum phenotype. It further shows that under some circumstances, "decanalization" can occur, in which the expression of adult phenotype becomes increasingly sensitive to developmental variation. This process can cause very similar populations to diverge from one another developmentally even when their adult phenotypes experience identical selection regimes.

(PDF emailed within 1 workday: $29.90)

Accession: 009576316

Download citation: RISBibTeXText

Related references

The Evolution of Canalization and the Breaking of Von Baer's Laws: Modeling the Evolution of Development with Epistasis. Evolution; International Journal of Organic Evolution 52(3): 647-656, 1998

Problems of macro evolution molecular evolution phenotype definition and canalization as seen from a hierarchical viewpoint. American Zoologist 15(2): 295-314, 1975

Modeling the evolution of genetic architecture: A continuum of alleles model with pairwise AxA epistasis. Journal of Theoretical Biology 203(2): 163-175, 2000

Individual development and evolution: experiential canalization of self-regulation. Developmental Psychology 48(3): 647-657, 2012

Early evolution of vertebrate skeletal tissues and cellular interactions, and the canalization of skeletal development. Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution 306(3): 278-294, 2006

Symmetry breaking and the evolution of development. Science 306(5697): 828-833, 2004

Development and Evolution, including Psychophysical Evolution, Evolution by Orthoplasy, and the Theory of Genetic Modes. The American Journal of the Medical Sciences 126(3): 524-525, 1903

Canalization of segmentation and its evolution in Drosophila. Proceedings of the National Academy of Sciences of the United States of America 104(26): 10926-10931, 2007

Canalization model of chromosomal evolution. Bulletin of Carnegie Museum of Natural History (13): 70-84, 1979

Canalization model of chromosome evolution. American Zoologist 18(3): 600, 1978

K. E. Von Baer's Perplexities over Evolution. Isis 37(1-2): 7-14, 1947

K.E. von Baer's perplexities over evolution. Isis; An International Review Devoted to the History of Science and Its Cultural Influences 37(107-108): 7-14, 2011

The canalization model of chromosomal evolution: a critique. Systematic Zoology 34: 75, 1985

Channelling evolution: canalization and the nervous system. Plos Biology 2(1): E19, 2004

Chaperones, Canalization, and Evolution of Animal Forms. International Journal of Molecular Sciences 19(10), 2018