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Nature. 1993 Feb 11;361(6412):490-2. The zootype and the phylotypic stage. Slack JM(1), Holland PW, Graham CF. Author information: (1)Department of Zoology, University of Oxford, UK. Comment in Nature. 1993 May 27;363(6427):307; author reply 307-8. Nature. 1993 May 27;363(6427):307; author reply 307-8. Nature.
Nov 5, 2007 Schmidt and Starck: Testing Evolutionary Hypotheses About the Phylotypic Stage of .. for the zootype. Using a large variety of vertebrate embryos, they found, beside het- erochronic shifts, differences in body size and body plan, such as changes has acted as a pace maker of evolution of development.
The Johns Hopkins. University Press, Baltimore, MD (1994). Saha, M. Spemann Seen through a Lens. In: Gilbert, S. F., editor. A Conceptual. History of Modern Embryology. The Johns Hopkins University Press,. Baltimore, MD (1994). Slack, J.M.W., et al. The Zootype and the Phylotypic Stage. Nature 361: 490–492 (1993).
The phylotypic stage is the most conserved stage of embryogenesis between species within a phylum. It is the point in which developing embryos of species in the same phylum display maximal similarity. Recently, molecular tools have been used to identify the phylotypic period based on the developmental stage that
The Johns Hopkins University Press ,. Baltimore, Maryland ( 1994 ). Saha , M. , Spemann Seen through a Lens . In: Gilbert , S. F. , editor, A Conceptual History of Modern. Embryology. The Johns Hopkins University Press , Baltimore, Maryland ( 1994 ). Slack , J. M. W. et al. ( 1993 ) The zootype and the phylotypic stage .
Jan 12, 2007 The zootype is defined by a common pattern of Hox gene expression among bilaterians, and is considered to be displayed most clearly at the phylotypic stage. We note, however, many conserved genes other than Hox are also involved in animal development, so comprehensive evaluation of these genes
The hourglass model of embryonic evolution predicts an hourglass-like divergence during animal embryogenesis – with embryos being more divergent at the earliest and latest stages but conserved during a mid-embryonic (phylotypic) period that serves as a source of the basic body plan for animals within a phylum.
Fate map for the 32 cell stage of Xenopus laevis. Development 99: 527-551. SLACK, J.M.W., HOLLAND, P.W.H. and GRAHAM, C.F. (1993). The zootype and the phylotypic stage. Nature 361: 490-492. General Teaching Philosophy. I favour traditional “top . Assessment is by practical write-up. Enrolment is about 40.
ABSTRACT. The phylotypic stage is the developmental stage at which vertebrates most resemble each other. In this study we test the plausibility of the hypotheses of Sander [1983, Development and. Evolution, Cambridge University Press] and Raff [1994, Early Life on Earth, Columbia University. Press; 1996, The Shape of
Nov 5, 2007 Schmidt and Starck: Testing Evolutionary Hypotheses About the Phylotypic Stage of .. for the zootype. Using a large variety of vertebrate embryos, they found, beside het- erochronic shifts, differences in body size and body plan, such as changes has acted as a pace maker of evolution of development.

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