How To Use Preformation In A Sentence
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Similarly, there is a “disposition, an aptitude, a preformation, which determines our soul and brings it about that [necessary truths] are derivable from it.”
Gottfried Wilhelm Leibniz
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Specification of the primordial germ cells (PGCs) takes place via different strategies across animal phyla; either specified early in embryogenesis by the inheritance of maternal determinants in the cytoplasm of the oocyte ( 'preformation') or selected later in embryonic development from undifferentiated precursors by a localized inductive signal ( 'epigenesis').
BioMed Central - Latest articles
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Wolff had risen up as an opponent of the so-called preformation theory, still widespread at that time, according to which the entire plant with all its different parts is already present in embryonic physical form in the seed, and simply grows out into space through physical enlargement.
Man or Matter
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Yet other preformationists believed that the sperm contained the embryo and some even claimed to be able to see a tiny human - a homunculus - in the head of each human sperm.
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The end of the 20th century brought discoveries that have challenged the most the prevailing geneticism, and have also begun to replace the extreme forms of either preformationism or epigenesist with the sorts of interactionist models that were only offered as outlying alternatives in earlier decades.
Epigenesis and Preformationism
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I think that it is interesting that Behe has toyed with the idea of a kind of preformation of the DNA, with the genes for such-and-such being designed into the genome at the beginning and remaining hidden over the generations until they were expressed. nickmatzke
The true origin of "intelligent design" - The Panda's Thumb
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Accordingly, near the turn of this century, many biologists who espoused or contested theories of evolution, meant, among other things, to support or undermine theories of the preformation of species according to a developmental plan.
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Moreover, information concerning both the co-occurrence of preformation and neoformation within the same shoot system is virtually non-existent.
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Epigenesis and preformation offer two competing interpretations of what is involved, with a range of alternatives in between.
Epigenesis and Preformationism
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Whitman felt that what biology needed was a clear statement of the alternative views, and then movement to a new standpoint examining how much depends on the organism's developmental response to external conditions drawing on preformation, rather than on programmed internal unfolding alone.
Epigenesis and Preformationism
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We should not accuse the preformationists of stupidity for placing the right idea into the wrong substance.
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If ‘seeing is believing,’ most still wanted to believe in preformation, and so they convinced themselves that they saw little men and tiny animals when they peered into their microscopes.
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No serious scientific preformationist held such a view.
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Lenny Moss (2003) identifies two gene concepts: the preformationist gene, Gene-P, defined by its relationship to a phenotype, is of instrumental utility for molecular geneticists ” for example, the BRCA1 gene is used to predict breast cancer risk; the epigenesist gene,
The Human Genome Project
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Each in turn examined the theory of preformation in the light of natural philosophy and religion.
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Thus, discussions of epigenesis and preformation often bring in other ancillary questions and are difficult to separate from their contexts.
Epigenesis and Preformationism
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The classification also encompasses physiological processes that are underlying phenomena of preformation and neoformation.
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The argument appears in an early form as an argument against embryonic development, and in favor of preformation.
The true origin of "intelligent design" - The Panda's Thumb
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Wolff was an epigenesist, maintaining that form emerges only gradually; Bonnet was a preformationist, insisting that form exists from the beginning of each individual organism and only experiences growth over time.
Epigenesis and Preformationism
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Development could not therefore be based on preformation but must be epigenetic, because during development many new cells are generated by division from the egg, and new types of cell are formed.
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The organogenetic event which initiated the neoformed organs continued until early autumn, giving rise to the following year's preformation.
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Yet their experiments ultimately led to new approaches and revised interpretations of what was at issue with epigenesist and preformationist accounts of development.
Epigenesis and Preformationism
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In the caricatured version, preformationism has usually been ridiculed as the belief that a perfect homunculus lies within each sperm or egg cell.
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In the first chapter, ‘Genesis of the gene,’ Moss traces the emergence of the modern conception of the gene back to the 18th century debate between preformationists and epigeneticists.
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Yet typically discussions of epigenesis and preformation have focused on individual organisms and their development rather than on species.
Epigenesis and Preformationism
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Generation and growth were on his view, mechanical processes, for, according to the doctrine of preformation, which he shared with Malebranche, generation is just growth.
Kant and Leibniz
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Yet other preformationists believed that the sperm contained the embryo and some even claimed to be able to see a tiny human - a homunculus - in the head of each human sperm.
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The early nineteenth century saw major developments in embryology, which challenged the mechanical concept of generation and overthrew the preformation theory.
