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gemmule    
n. 小芽,无性芽,芽球

小芽,无性芽,芽球

gemmule
n 1: the physically discrete element that Darwin proposed as
responsible for heredity

Gemmule \Gem"mule\, n. [L. gemmula, dim. of gemma: cf. F.
gemmule. See {Gem}.]
1. (Bot.)
(a) A little leaf bud, as the plumule between the
cotyledons.
(b) One of the buds of mosses.
(c) One of the reproductive spores of alg[ae].
(d) An ovule.
[1913 Webster]

2. (Biol.)
(a) A bud produced in generation by gemmation.
(b) One of the imaginary granules or atoms which,
according to Darwin's hypothesis of pangenesis, are
continually being thrown off from every cell or unit,
and circulate freely throughout the system, and when
supplied with proper nutriment multiply by
self-division and ultimately develop into cells like
those from which they were derived. They are supposed
to be transmitted from the parent to the offspring,
but are often transmitted in a dormant state during
many generations and are then developed. See
{Pangenesis}.
[1913 Webster]


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  • Gemmule - Wikipedia
    Gemmule Gemmules are internal buds found in sponges and are involved in asexual reproduction It is an asexually reproduced mass of cells, that is capable of developing into a new organism i e , an adult sponge [1]
  • Gemmule - Formation, Structure and Role in Sponge Reproduction
    Definition of Gemmule: A gemmule is an asexually formed clump of cells that can differentiate into an adult freshwater sponge These are tiny, bud-like clusters of cells that sponges generate to survive harsh environmental conditions
  • Gemmule, Gemmulation: Definition, Meaning, Introduction, Parts . . .
    A gemmule contains a cluster of archaeocytes surrounded by a protective covering made of spicules and spongin It also has a micropyle through which cells can emerge
  • Gemmules: Structure, Formation Role in Sponge Reproduction - Vedantu
    Gemmule formation is a crucial survival strategy because it allows the sponge lineage to achieve dormancy and persist through periods of extreme environmental stress The gemmule's tough, multi-layered coat effectively shields the vital archaeocytes from freezing, drying, and oxygen deprivation
  • GEMMULE Definition Meaning - Merriam-Webster
    More from Merriam-Webster on gemmule Britannica com: Encyclopedia article about gemmule Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged
  • Gemmule | Britannica
    Other articles where gemmule is discussed: sponge: Asexual reproduction: These so-called “gemmules” are expelled from the adult sponge and, in some marine species, serve as a normal reproductive process or, sometimes, as a means to carry the sponges over periods of unfavourable conditions when the adults degenerate; e g , drought
  • Gemmule Definition and Examples - Biology Online Dictionary
    Gemmule in the largest biology dictionary online Free learning resources for students covering all major areas of biology
  • Gemmule - definition of gemmule by The Free Dictionary
    Define gemmule gemmule synonyms, gemmule pronunciation, gemmule translation, English dictionary definition of gemmule n 1 A small gemma or similar structure, especially a reproductive structure in certain sponges that remains dormant for some time and later develops into
  • gemmule - Wiktionary, the free dictionary
    Noun gemmule (plural gemmules) (biology) (archaic) Synonym of gemma (“an asexual reproductive structure, as found in animals such as hydra (genus Hydra) and plants such as liverworts (division Marchantiophyta), consisting of a cluster of cells from which a new individual can develop ”)
  • Gemmule - grokipedia. com
    In biology, a gemmule is an asexual reproductive structure produced by certain freshwater sponges (phylum Porifera)





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