Charles Darwin famously concluded On the Origin of Species with a vision of “endless forms most beautiful” continually evolving. More than 150 years later many evolutionary biologists see not endless forms but the same, or very similar, forms evolving repeatedly in many independent species lineages. A porpoise’s fishlike fins, for example, are not inherited from fish ancestors but are independently derived convergent traits.
Each of us is a collection of more than ten trillion cells, busy performing tasks crucial to our continued existence. Gene regulation networks, consisting of a subset of genes called transcription factors, control cellular activity--producing the right gene activities for the many situations that the multiplicity of cells in our bodies face. Genes working together make up a truly ingenious system. In this book, Roger Sansom investigates how gene regulation works and how such a refined but simple system evolved.
Chimeras and Consciousness begins the inquiry into the evolution of the collective sensitivities of life. Scientist-scholars from a range of fields—including biochemistry, cell biology, history of science, family therapy, genetics, microbial ecology, and primatology—trace the emergence and evolution of consciousness. Complex behaviors and the social imperatives of bacteria and other life forms during 3,000 million years of Earth history gave rise to mammalian cognition.
In 1995, John Maynard Smith and E√∂rs Szathm√°ry published their influential book The Major Transitions in Evolution. The "transitions" that Maynard Smith and Szathm√°ry chose to describe all constituted major changes in the kinds of organisms that existed but, most important, these events also transformed the evolutionary process itself. The evolution of new levels of biological organization, such as chromosomes, cells, multicelled organisms, and complex social groups radically changed the kinds of individuals natural selection could act upon.
In 1809—the year of Charles Darwin’s birth—Jean-Baptiste Lamarck published Philosophie zoologique, the first comprehensive and systematic theory of biological evolution. The Lamarckian approach emphasizes the generation of developmental variations; Darwinism stresses selection. Lamarck’s ideas were eventually eclipsed by Darwinian concepts, especially after the emergence of the Modern Synthesis in the twentieth century.
The work performed by living systems ranges from photosynthesis to prodigious feats of computation and organization. This multidisciplinary volume explores work across many different levels of organization. By addressing how work gets done, and why, from the perspectives of research in a range of disciplines, including cellular and evolutionary biology, neuroscience, psychology, electrical and computer engineering, and design, the volume sets out to establish an integrative perspective on understanding work in living systems, including humans.
In the six decades since the publication of Julian Huxley's Evolution: The Modern Synthesis, spectacular empirical advances in the biological sciences have been accompanied by equally significant developments within the core theoretical framework of the discipline. As a result, evolutionary theory today includes concepts and even entire new fields that were not part of the foundational structure of the Modern Synthesis.
Humans have bred plants and animals with an eye to aesthetics for centuries: flowers are selected for colorful blossoms or luxuriant foliage; racehorses are bred for the elegance of their frames. Hybridized plants were first exhibited as fine art in 1936, when the Museum of Modern Art in New York showed Edward Steichen's hybrid delphiniums. Since then, bio art has become a genre; artists work with a variety of living things, including plants, animals, bacteria, slime molds, and fungi.
This classic work by Julian Huxley, first published in 1942, captured and synthesized all that was then known about evolutionary biology and gave a name to the Modern Synthesis, the conceptual structure underlying the field for most of the twentieth century. Many considered Huxley's book a popularization of the ideas then emerging in evolutionary biology, but in fact Evolution: The Modern Synthesis is a work of serious scholarship that is also accessible to the general educated public.
In recent years an interest in applying the principles of evolution to the study of culture emerged in the social sciences. Archaeologists and anthropologists reconsidered the role of innovation in particular, and have moved toward characterizing innovation in cultural systems not only as a product but also as an evolutionary process.