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  • noun

Words related to gemmule

the physically discrete element that Darwin proposed as responsible for heredity

References in periodicals archive ?
White and green sponges were observed in both rivers and contained numerous basal gemmules near attachment with substrate.
Newly formed gemmules are in an obligate state of developmental (and potentially metabolic) arrest that is termed diapause.
At the initiation of the experiment, the cold stream water was decanted from all of the gemmule samples and was replaced by filtered stream water at 20 [degrees] C.
Volkmer-Ribeiro (1992) mentions the abundant presence of gemmules in all the collected sponge specimens, in this seasonal environment.
Nor could he describe how gemmules were modified, how they were "thrown off," or even what they were.
Such inferences included the notion that cells throw off gemmules, these gemmules are carried through the body, they multiply by division, and they are transmitted from generation to generation in the dormant state, finally coming together in the ovaries and testes.
In the fall and winter months, the larger framework of the sponge deteriorates and gemmules form.
Absolute space, absolute time, phlogiston, and gemmules were at one time deemed essential; more recendy, dark matter and dark energy have been added.
Darwin even proposed a Lamarkian form of inheritance called gemmules which gave a kind of environmental feed back into the genome of organisms (Darwin, C.
Skeleton composing three areas of differing reticular condensation: very closed but cavernous reticulum full of gemmules at the base, close and continuos reticulum in the middle, and an open reticulum with thick fibers towards the surface; original main fibers can be however perceived extending from the base up to the conulose projections.
the board, with Dalton's odd atoms, Darwin's gemmules and Lamarck's
His theory of pangenesis, for example, states that each part of the adult body produces gemmules that make their way into the sexual organs for reproduction; in this way, traits acquired by adults can be passed on to their young.
Sponge identification is based largely on spicule morphology and care was taken to collect specimens bearing gemmules, as well as somatic tissue.
In freshwater invertebrates, dormant stages include gemmules (sponges), statoblasts (bryozoans), and resting eggs (turbellarians, rotifers, and microcrustaceans) (see Pennak 1989).