How to use gametophyte in a sentence

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Sentence Examples The sporogenous cells of the ovary lead to the production of the female gametophyte or embryo sac that contains the egg cell. Each consists of an egg cell embedded in the tissue of the female gametophyte surrounded by a thick seed coat. The plant life cycle alternates between a diploid sporophyte and a haploid gametophyte generation. Some genes have been shown to be expressed in the female gametophyte before fertilization. Many algae are characterized by an alternation of haploid gametophyte and diploid sporophyte generations. For example, in mosses the sporophyte is a capsule atop a slender stalk that grows out of the top of the gametophyte. Other aberrant gametophyte phenotypes were observed among the group of mutants that could form antheridia. Apogamous outgrowths form directly from the gametophyte and produce a new sporophyte without syngamy. In maize, in particular, cell death events are known to occur throughout normal development both in the sporophyte and in the gametophyte. The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore. It is believed that the gametophyte generation also had water-conducting tissue, cuticle, and stomata, making this species isomorphic. In the spermatophytes, the situation is reversed, and the gametophyte is the smaller and dependent generation. The antipodal cells are much smaller than the other cells of the gametophyte and typically persist beyond anthesis. Since the asexual gametophyte does not form antheridia or archegonia, crosses to confirm its genotype could not be performed. 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. The reduction in cell number of the female gametophyte and embryo allows a large number of megasporogenesis events to occur in the ovary. A typical, mature Osmunda cinnamomea gametophyte was cordate and without trichomes. In adventitious embryony, the embryo develops directly from nucellar or chalazal tissue without an intervening gametophyte stage. According to this argument, heterospory was the intermediate between homosporous free-sporing reproduction and the retained endosporic gametophyte of the seed habit. In contrast, apogamy is the development of 1n sporophytes without gametes and syngamy from vegetative cells of the gametophyte. Show More Sentences Self-fertilization of hermaphroditic gametophytes can occur, and several sporophytes may be produced on one gametophyte. The antipodal cells of the female gametophyte sometimes acquire glandular properties, as may cells of the nucellus surrounding the embryo sac. Following meiosis, four haploid tetraspores are produced, which germinate to produce either a male or a female gametophyte. Finally, a form of haploid apogamy is known in which a cell of the female gametophyte other than an egg may develop into an embryo. Because of the different shape of gametophyte and sporophyte, the generation change is called heteromorphous. Ultimately, the gametophyte grows from a small bud produced by a cell of the protonema that divides and differentiates. The young sporophyte remains in physical contact with the megaspore and the enclosed female gametophyte tissue for some time. In lily, all 4 megaspore nuclei are involved in the formation of the female gametophyte. The female gametophyte grows at the expense of nucellar tissue but remains enclosed within its remains. Among nonvascular plants, true parenchyma is found in the bryophytes, in both the gametophyte and sporophyte phases. The sporangium ruptures and releases spores, which germinate, ultimately into the gametophyte. The gametophyte is a small ribbonlike thallus that resembles a thallose liverwort. Once the sporophyte has developed independent existence and the root has penetrated the soil, the gametophyte soon shrivels. Ultimately the sporophyte becomes physiologically independent of the gametophyte, and the latter dies. If these both wouldn't belong to the same species, the sporophyte could be called a parasite on the gametophyte. The alternation between haploid gametophyte and diploid sporophyte phases, known as alternation of generations, occurs in all multi-cellular plants. The placentas are likewise the same in the four genera and comprise elongate haustorial sporophyte cells growing into the closely adjacent gametophyte cells. Bryophytes reproduce through syngamy and meiosis, but the dominant stage of the plant is the gametophyte, as opposed to the sporophyte in vascular plants. In all land plants, the two alternating generations are morphologically dissimilar, and the gametophyte is initially dominant over the sporophyte. In other species, including nearly all those of the north temperate zone, the gametophyte is subterranean, slower growing, and dependent upon an associated fungus for continued growth. Show More Sentences The gametophyte is dried and nearly invisible. It includes parthenogenesis in animals, in which the new individual develops from the unfertilized egg, and apogamy in certain plants, in which the generative tissue may be the sporophyte or the gametophyte. The kelp life cycle involves a diploid sporophyte and haploid gametophyte stage. Postelsia has two distinct morphologies: one for its diploid, monoicous sporophyte stage, which is the dominant portion of the life cycle, and one for its smaller, haploid, dioecious gametophyte stage. Each gametophyte was also scored for the number of antheridia and archegonia present. These final stages in development usually occur on the soil after the megaspore with the enclosed female gametophyte is shed from the megasporangium. Coleochaete and embryophytes retain their zygotes on the maternal gametophyte, whereas Chaetosphaeridium expels its ova before fertilization. Root tips of sporophytes or prothalli in gametophyte phase were used for chromosome counts. The resulting prothalli were used as the third type of explants for gametophyte regeneration. Lethal effects on survival of zoospore and gametophyte of Eisenia bicyclis exerted by suspended particle and deposited sediment. From here, a pollen tube seeks out the female gametophyte and if successful, fertilization occurs. The diploid sporophytes appear only occasionally and remain attached to and nutritionally dependent on the gametophyte. These are dispersed, most commonly by wind, and if they land in a suitable environment can develop into a new gametophyte. As in liverworts and hornworts, the haploid gametophyte generation is the dominant phase of the life cycle. Following pollination and fertilization, the ovule developed into a seed with an embryo nested in the fleshy female gametophyte, which served as a food source during germination and seedling growth. The gametophyte consists of unicellular sterile hairs and lateral gametangia. Meanwhile in the nucellus, a single megaspore mother cell undergoes meiosis, forming a tetrad of haploid megaspores, only one of which survives to divide mitotically many times and form a large fleshy female gametophyte. Archegonia are distributed on the lower surface of the gametophyte at the apical end of cushion and near the meristematic region. Floral vasculature, sporogenesis and gametophyte development in Pentastemona egregia. A nucule could therefore be interpreted either as a dispersed zygote or as a detached gametophyte fragment with a retained zygote. Show More Sentences The male gametophyte phase of the life cycle begins in the microsporangium with meiotic production of tetrads of microspores followed by the division of each haploid microspore into a three-celled pollen grain. The female gametophyte corresponds to the embryo sac and covers an egg cell, a central cell, two synergid cells, and several antipodal cells. Review the following terms and their significance for plant reproduction: flower, stamen, perianth, carpel, microsporangium, megasporangium, female gametophyte, male gametophyte. Over the next three to five months, the male gametophyte develops into a haustorial pollen tube, which eventually penetrates the nucellus and partially projects into an archegonial chamber. Secondly, the sporophyte phase of bryophytes remains attached to its gametophyte parent throughout its development to maturity and often past spore release. In vascular cryptogams, the sporophyte, though usually becoming independent, nonetheless has early stages that are heavily dependent on the gametophyte. The gametophyte, again presumably because of demands for water for fertilization, remained relatively small and more or less thallophytic in structure. Sporophytes are raised on stalks to facilitate spore dispersal, but unlike other mosses, Sphagnum stalks are produced by the maternal gametophyte. Soon afterwards the protonema develops buds and these differentiate into its characteristic, erect, leafy, branched gametophyte with chlorophyllose cells and hyaline cells. The term monoicous may be used where antheridia and archegonia occur on the same gametophyte and the term dioicous where they occur on different gametophytes. Examples from Classical Literature Thus in Pellia the nuclei of the gametophyte have eight chromosomes and those of the sporophyte sixteen. When artificially divided small fragments of the gametophyte are found to be capable of growing into new individuals. The organization of the gametophyte stands in the closest relation to the factors of light and moisture in the environment. In a later paper Pearson considerably extended our knowledge of the reproduction and gametophyte of this genus. Find more words! 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What is the adverb for gametophyte? What is the adjective for gametophyte? What is the noun for gametophyte? Use our Sentence Generator Nearby Words gametophore gametogenic gametogenesis gametocyte gametic gametes gametophytes gametophytic gamey gamier gamification gamin 11-letter Words Starting With g ga gam game gamet gameto gametop gametoph gametophy gametophyt