Models for Embryonic Periodicity
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Description: Spatially periodic patterns like zebra stripes or insect segments are mysteriously precise. How do they form during development? The deeper question, which lies at the heart of developmental biology, is: How do cells in different places within an embryo acquire different states of gene expression? In principle, there are three possible answers: either a cell's position causes its state, or its state causes its position, or both are caused by some third agent. These alternatives provide a framework for classifying theoretical models. Positional information models, the most widely used today, belong to the first category. Dozens of rival schemes have been proposed, but until now many have been overlooked because they were obscured by confusing jargon, impenetrable mathematics, or tortuous logic.In order to facilitate comparisons, this book (1) strips away all ad hoc assumptions to expose the central tenets of each model, (2) traces the historical roots and familial relationships among different types of models, and (3) illustrates the rules of each model in terms of how it would solve the same basic problem. It also reexamines the computer metaphor in developmental biology: Are embryonic cells robots in disguise? The surprising answer, based upon their ability to perform Boolean logic, store and process information, execute iterative subroutines ... and malfunction in predictable ways ... is yes!This valuable text by the author of the acclaimed new book Imaginal Discs (Cambridge University Press) is required reading for biologists and zoologists interested in the pattern subfield of developmental biology.
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All the information you need in one place! Each Study Brief is a summary of one specific subject; facts, figures, and explanations to help you learn faster.
List price: $35.00
Publisher: S. Karger AG
Publication date: 6/30/1998
Size: 6.00" wide x 8.75" long x 0.50" tall
|Types of Patterning Mechanisms|
|Positional Information Mechanisms|
|The Gradient Model|
|The Polar Coordinate Model|
|The Progress Zone Model|
|Puzzles and Paradoxes|
|Models Involving Physical Forces|
|Induction Across Layers|
|Prepatterns vs. Positional Information|
|Determination Wave Mechanisms|
|The Sequential Induction Model|
|The Clock-and-Wavefront Model|
|Inhibitory Field Models|
|Cell Death Models|
|The Quantal Mitosis Model|
|The Stem Cell Model|
|L-Systems and Fractal Geometry|
|The Cortical Inheritance Model|
|The Computer Metaphor in Developmental Biology|
|Local vs. Global Information|
|Binary Codes and Boolean Logic|
|Stent's Cat, Brenner's Virus, and the 'Homeobox Homunculi'|
|Subroutines and Modules|
|Iteration and Halt Conditions|
|Input-Output, 'Morphospaces', and Evolutionary Constraints|