Colloquium
3:30 p.m., Monday, January 15
Math 100
Sergey Gavrilets
University of Tennessee
Evolutionary dynamics on holey adaptive landscapes
The world as we perceive it is three dimensional. Physicists
currently believe one needs on the order of a dozen dimensions
to explain physical world. However, biological evolution occurs
in a space with millions dimensions. Sewall Wright's powerful
metaphor of rugged adaptive landscapes with its emphasis on
adaptive peaks and valleys is based on analogies coming from
our three-dimensional experience. Because the properties of
multidimensional adaptive landscapes are very different
from those of low dimension, for many biological questions Wright's
metaphor is not useful or is even misleading. A new unifying
framework that provides a plausible multidimensional alternative
to the conventional view of rugged adaptive landscapes is emerging
for deepening our understanding of evolution and speciation.
The focus of this framework are percolating (nearly) neutral
networks of well-fit genotypes which appear to be a common feature
of genotype spaces of high dimensionality. A variety of important
evolutionary questions have been approached using the new framework.
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