preformation

How To Use preformation In A Sentence

• 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
• 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
• 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
• 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.
• 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
• 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
• 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.
• Moreover, information concerning both the co-occurrence of preformation and neoformation within the same shoot system is virtually non-existent.
• Epigenesis and preformation offer two competing interpretations of what is involved, with a range of alternatives in between. Epigenesis and Preformationism
• 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