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Homology, Genes, and Evolutionary Innovation (Paperback)
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Homology, Genes, and Evolutionary Innovation (Paperback)
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A major synthesis of homology, written by a top researcher in the
field Homology-a similar trait shared by different species and
derived from common ancestry, such as a seal's fin and a bird's
wing-is one of the most fundamental yet challenging concepts in
evolutionary biology. This groundbreaking book provides the first
mechanistically based theory of what homology is and how it arises
in evolution. Gunter Wagner, one of the preeminent researchers in
the field, argues that homology, or character identity, can be
explained through the historical continuity of character identity
networks-that is, the gene regulatory networks that enable
differential gene expression. He shows how character identity is
independent of the form and function of the character itself
because the same network can activate different effector genes and
thus control the development of different shapes, sizes, and
qualities of the character. Demonstrating how this theoretical
model can provide a foundation for understanding the evolutionary
origin of novel characters, Wagner applies it to the origin and
evolution of specific systems, such as cell types; skin, hair, and
feathers; limbs and digits; and flowers. The first major synthesis
of homology to be published in decades, Homology, Genes, and
Evolutionary Innovation reveals how a mechanistically based theory
can serve as a unifying concept for any branch of science concerned
with the structure and development of organisms, and how it can
help explain major transitions in evolution and broad patterns of
biological diversity.
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