gametophyte

gametophyte
—gametophytic /geuh mee'teuh fit"ik, gam'i-/, adj.
/geuh mee"teuh fuyt', gam"i-/, n. Bot.
the sexual form of a plant in the alternation of generations. Cf. sporophyte.
[1890-95; GAMETO- + -PHYTE]

* * *

In certain plants, the sexual phase (or an individual representing the phase) in the alternation of generations.

The alternate, nonsexual phase is the sporophyte. In the gametophyte phase, male and female organs (gametangia) develop and produce eggs and sperm (gametes), which unite in fertilization (syngamy). The fertilized egg (zygote) develops into the sporophyte, which produces numerous single-celled spores, which in turn develop directly into new gametes.

* * *

▪ plant stage
      in certain plants, sexual phase (or an individual representing the phase) in the alternation of generations—a phenomenon in which two distinct phases occur in the life history of the plant, each phase producing the other. The alternate, nonsexual phase is the sporophyte.

      In the gametophyte phase, male and female organs (gametangia) develop and produce eggs and sperm (gametes), which unite in fertilization (syngamy). The fertilized egg (zygote) develops into the sporophyte phase, which produces numerous unicellular spores. These, in turn, develop directly into new gametes. Almost the entire life cycle of many algae and fungi is gametophyte; in others it is almost all sporophyte. See also sporophyte.

* * *


Universalium. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Gametophyte — Gamétophyte schéma du cycle reproductif des Embryophytes Le gamétophyte est la génération du cycle de vie qui produit les gamètes de la plante. En d autres termes, c est l individu issu d une méiospore et produisant des gamètes. Le gamétophyte n… …   Wikipédia en Français

  • gamétophyte — ● gamétophyte nom masculin Organisme végétal issu d une spore, destiné à former les gamètes et reconnaissable dans les espèces végétales où il existe une alternance des générations. gamétophyte n. m. BOT Individu haploïde, sexué ou hermaphrodite …   Encyclopédie Universelle

  • Gametophyte — Ga*me to*phyte, n. [Gamete + Gr. fyto n plant.] (Bot.) In the alternation of generations in plants, that generation or phase which bears sex organs and produces gametes. In the lower plants, as the alg[ae], the gametophyte is the conspicuous part …   The Collaborative International Dictionary of English

  • gametophyte — gametophyte. См. гаметофит. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • gametophyte — [gə mēt′əfīt΄] n. in plants, the gamete bearing generation that is haploid and reproduces by eggs and sperms: distinguished from SPOROPHYTE gametophytic [gə mēt′əfit′ik] adj …   English World dictionary

  • Gametophyte — Several gametophytes growing in a terrarium. Protonema of the …   Wikipedia

  • Gamétophyte — schéma du cycle reproductif des Embryophytes Le gamétophyte est la génération du cycle de vie qui produit les gamètes de la plante. En d autres termes, c est l individu issu d une méiospore et produisant des gamètes. Le gamétophyte n est pas… …   Wikipédia en Français

  • gametophyte — The phase of the plant life cycle that carries the gamete producing organs. In flowering plants, the pollen grain is the male gametophyte and the embryo sac is the female gametophyte …   Glossary of Biotechnology

  • gametophyte — gametofitas statusas T sritis augalininkystė apibrėžtis Lytinė žiedinių augalų karta, turinti perpus mažesnį (haploidinį) chromosomų skaičių negu sporofitas. atitikmenys: angl. gametophyte rus. гаметофит; половое поколение ryšiai: sinonimas –… …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • gametophyte incompatibility — gametofitinis nesuderinamumas statusas T sritis augalininkystė apibrėžtis Nesuderinamumas, lemiamas alelinių genų (S), tarp kurių nėra dominavimo sąveikos. Taip būna, kai liemenėlis ir žiedadulkė turi tokius pat alelius ir dėl to slopinamas… …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”