How To Use Gametophyte In A Sentence
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The angiosperm female gametophyte, called the embryo sac, consists of four cell types: synergid, antipodal, egg, and central cell.
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The sporogonium is parasitic on the gametophyte generation.
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Figure 17.6 Key Haploid (n) Diploid (2 n) Egg (n) Zygote (2 n) Sperm (n) (released from male gametangium) Gametophyte (n) (underside) Fertilization Clusters of sporangia New sporophyte (2 n) growing out of gametophyte Mature sporophyte (independent of gametophyte)
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When artificially divided small fragments of the gametophyte are found to be capable of growing into new individuals.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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A few grains were seen which had shed the exine and released a circular microgametophyte, although the actual process was not observed.
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The alternation between haploid gametophyte and diploid sporophyte phases, known as alternation of generations, occurs in all multi-cellular plants.
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The egg cells and antherozoids are collectively known as gametes, and the generation of the moss plant that bears them is known as a gametophyte.
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In adventitious embryony, the embryo develops directly from nucellar or chalazal tissue without an intervening gametophyte stage.
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To expose gametophytes to particular photoperiodic conditions, the bagged Petri plates were placed in a light-tight box over which was installed the fluorescent source.
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During sexual megagametophytic development (with the embryo sac as the megagametophyte and the egg cell as megagamete), a sub-epidermal cell of the nucellus tissue differentiates into a megaspore-mother cell which undergoes meiosis I and II to form four megaspores.
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The gametophyte or prothallial generation is thus extremely reduced, consisting of but little more than the male and female sexual cells -- the two sperm-cells in the pollen-tube and the egg-cell (with the synergidae) in the embryo-sac.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Furthermore, logs provide persistent, exposed substrate where thalloid gametophytes can escape smothering by deciduous hardwood leaf litter.
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Parallel with the evolution of the gametophyte in form and structure, a progression can be traced in the sporogonium, although the simplest sporogonia available for study may owe much of their simplicity to reduction.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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In the spermatophytes, the situation is reversed, and the gametophyte is the smaller and dependent generation.
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Other aberrant gametophyte phenotypes were observed among the group of mutants that could form antheridia.
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Sometimes she could remember, sometimes there were flashes of brilliance, but sometimes she was lucky to remember the difference between the gametophyte and sporophyte stages of a fern.
Beowulf's Children
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The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Sometimes she could remember, sometimes there were flashes of brilliance, but sometimes she was lucky to remember the difference between the gametophyte and sporophyte stages of a fern.
Beowulf's Children
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The sexual form, called the gametophyte or prothallia, is a tiny kidney-shaped plant and difficult to find in the wild.
Undefined
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It is concluded that mosses suffer detrimental effects after exposure to Asulox at concentrations similar to those that affect fern gametophytes such as bracken.
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Many algae are characterized by an alternation of haploid gametophyte and diploid sporophyte generations.
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For example, in mosses the sporophyte is a capsule atop a slender stalk that grows out of the top of the gametophyte.
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The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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The reduction in cell number of the female gametophyte and embryo allows a large number of megasporogenesis events to occur in the ovary.
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Ulva produces isomorphic thalli for its diploid sporophyte and haploid gametophyte.
Mutation, selection and complexity - The Panda's Thumb
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According to this argument, heterospory was the intermediate between homosporous free-sporing reproduction and the retained endosporic gametophyte of the seed habit.
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A typical, mature Osmunda cinnamomea gametophyte was cordate and without trichomes.
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Placental morphology is remarkably diverse between major bryophyte groups, especially with regard to the presence and distribution of transfer cells in the sporophyte and gametophyte.
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Bryophytes are characterized by their dominant gametophytic plant body and their sporophytes epiphytic to gametophytes.
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Some genes have been shown to be expressed in the female gametophyte before fertilization.
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More recent work suggests that the cell wall hydrolase, pectin methyl esterase, plays a role in weakening of the megagametophyte, allowing radicle emergence and the completion of germination.
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The organization of the gametophyte stands in the closest relation to the factors of light and moisture in the environment.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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They differ from the ‘green algae’ in that the young sporophyte - or diploid plant - begins its development within the tissues of its parent gametophyte - or haploid plant.
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W.A. DiMichele has argued that free-sporing heterospory will only be favored in swamp environments, where gametes can move easily between unisexual gametophytes.
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Apogamous outgrowths form directly from the gametophyte and produce a new sporophyte without syngamy.
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In maize, in particular, cell death events are known to occur throughout normal development both in the sporophyte and in the gametophyte.
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The plant life cycle alternates between a diploid sporophyte and a haploid gametophyte generation.
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Simultaneous analysis of the haploid megagametophyte and diploid embryo in a seed allows the female and male gametic contributions to the zygote to be separated.
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The prothallus is the gametophyte generationof a fern.
CreationWiki - Recent changes [en]
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Each consists of an egg cell embedded in the tissue of the female gametophyte surrounded by a thick seed coat.
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Male sex organs known as antheridia and female sex organs, which are referred to as archegonia, are typically located at the tips of the main shoots of gametophyte mosses.
Undefined
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Higher Education (University +) apospory is The development of a gametophyte directly from a sporophyte without the occurrence of meiosis or spore formation and apogamy is Why do leaves turn colors in the fall but not grass?
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It is believed that the gametophyte generation also had water-conducting tissue, cuticle, and stomata, making this species isomorphic.
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The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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These features suggest that the common ancestor of charophytes and land plants had a life cycle similar to that of charophytes, and that the common ancestor of bryophytes and vascular plants was gametophyte-dominant.
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Since the asexual gametophyte does not form antheridia or archegonia, crosses to confirm its genotype could not be performed.
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The tetraspores and the gametophytes are the only haploid stages in the coralline algae.
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The antipodal cells are much smaller than the other cells of the gametophyte and typically persist beyond anthesis.
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This is a new feature and contrasts with most free-sporing plants in which sperm, rather than the whole microgametophyte, move to the archegonia.
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These different responses between tetraspores and carpospores, suggest a different ecophysiological response with regard to survival and interspecific competition in nature of the gametophyte vs sporophyte.
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The rupture occurred, in the first instance, at a meiotic anaphase in each parent, and the ruptured end then underwent the succession of mitotic anaphase breaks associated with the chromatid type of breakage-fusion-bridge cycle during the development of the male and female gametophytes -- the pollen grain and the embryo sac.
Nobel Lecture The Significance of Responses of the Genome to Challenge
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Ulva produces isomorphic thalli for its diploid sporophyte and haploid gametophyte.
Mutation, selection and complexity - The Panda's Thumb
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Ulva produces isomorphic thalli for its diploid sporophyte and haploid gametophyte.
Mutation, selection and complexity - The Panda's Thumb
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The polarity of the micro-gametophyte (pollen grain) of flowering plants is related to the proximal-distal axis of the microspore from which it develops.
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Unlike vascular plants, the haploid gametophyte generation is dominant in mosses.
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The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore.
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Anthocerotales are a small and very distinct group, in which the gametophyte is a thallus, while the sporogonium possesses a sterile columella and is capable of long-continued growth and spore production.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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Bryophytes reproduce through syngamy and meiosis, but the dominant stage of the plant is the gametophyte, as opposed to the sporophyte in vascular plants.
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Gametophytes became sexually mature in 2 weeks and the first leaves of the sporophytes became visible in about 4 weeks.
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Dispersed by wind, these small spores germinate into small, freeliving, disc-shaped gametophytes that produce either archegonia - organs in which egg cells are formed - or sperm-producing antheridia.
