A gametangium (plural: gametangia) is an organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In Biology, an organ ( Latin: organum, "instrument tool" from Greek όργανον - organon "organ instrument The cell is the structural and functional unit of all known living Organisms It is the smallest unit of an organism that is classified as living and is often called A gamete (from Ancient Greek γαμέτης; translated gamete = wife gametes = husband is a cell that fuses with another gamete Protists (ˈproʊtɨst are a diverse group of eukaryotic Microorganisms Historically protists were treated as the kingdom Protista but this Algae ( sing. alga are a large and diverse group of simple typically Autotrophic organisms ranging from Unicellular to Multicellular forms A fungus (ˈfʌŋgəs is a eukaryotic Organism that is a member of the kingdom Fungi (ˈfʌndʒaɪ In Plants and Algae that undergo Alternation of generations, a gametophyte is the multicellular structure or phase that is Haploid, containing Plants are living Organisms belonging to the kingdom Plantae. In contrast to gametogenesis in animals, a gametangium is a haploid structure and formation of gametes does not involve meiosis. Gametogenesis is a process by which diploid or haploid precursor cells undergo cell division and differentiation to form mature haploid Gametes Depending on the Biological "Haplo" redirects here For the fictional character see The Death Gate Cycle. In Biology or life science meiosis (pronounced my-oh-sis is a process of reductional division in which the number of chromosomes per cell is cut in half
Contents |
Types of gametangia
Depending on the type of gamete produced in a gametangium, several types can be distinguished.
Female
Female gametangia are most commonly called archegonia. An archegonium (pl archegonia) from the Ancient Greek ἀρχή ("beginning" and γόνος ("offspring" is a multicellular An archegonium (pl archegonia) from the Ancient Greek ἀρχή ("beginning" and γόνος ("offspring" is a multicellular They produce egg cells and are the sites for fertilization. An ovum (plural ova) is a Haploid Female reproductive cell or Gamete. For soil improvement see Fertilization (soil. Archegonia are common in algae and primitive plants as well as gymnosperms. Gymnosperm (Gymnospermae are a group of Spermatophyte seed-bearing Plants with Ovules on the edge or blade of an open Sporophyll, which are In flowering plants, they are replaced by the embryo sac inside the ovule. The flowering plants or angiosperms ( Angiospermae or Magnoliophyta) are the most widespread group Ovule literally means "small egg." In Seed plants the ovule is the structure that gives rise to and contains the female reproductive cells Ovule literally means "small egg." In Seed plants the ovule is the structure that gives rise to and contains the female reproductive cells
Male
The male gametangia are most commonly called antheridia. An antheridium (plural antheridia) is a Haploid structure or organ producing and containing male Gametes (called antherozoids or Sperm An antheridium (plural antheridia) is a Haploid structure or organ producing and containing male Gametes (called antherozoids or Sperm They produce sperm cells that they release for fertilization. The term sperm is derived from the Greek word (σπέρμα sperma (meaning "seed" and refers to the male reproductive cells. Antheridia producing non-motile sperm (spermatia) are called spermatangia. Some antheridia do not release their sperm. For example, the oomycete antheridium is a syncytium with many sperm nuclei and fertilization occurs via fertilization tubes growing from the antheridium and making contact with the egg cells. Oomycetes also known as Water molds (or water moulds: see spelling differences) are a group of filamentous unicellular Heterokonts physically In Biology, a syncytium ( plural syncytia) is a large cell-like structure filled with Cytoplasm containing many nuclei In Cell biology, the nucleus (pl nuclei; from Latin la ''nucleus'' or la ''nuculeus'' "little nut" or kernel is a membrane-enclosed Antheridia are common in the gametophytes in "lower" plants such as bryophytes, ferns, cycads and ginkgo. In Plants and Algae that undergo Alternation of generations, a gametophyte is the multicellular structure or phase that is Haploid, containing Bryophytes are all Embryophytes ('land Plants) that are non-vascular: they have tissues and enclosed reproductive systems but they lack Vascular tissue A fern is any one of a group of about 20000 Species of Plants classified in the phylum or division Pteridophyta, also known as Filicophyta Cycads are a group of Seed plants characterized by a large crown of compound leaves and a stout trunk. Ginkgo is a genus of highly unusual non-flowering plants with one extant species G In "higher" plants such as conifers and flowering plants, they are replaced by pollen grains. The flowering plants or angiosperms ( Angiospermae or Magnoliophyta) are the most widespread group Pollen is a fine to coarse powder consisting of microgametophytes ( pollen grains) which produce the male Gametes (sperm cells of
Isogamous
In isogamy, the gametes look alike and cannot be classified into "male" or "female. Isogamy refers to a form of Sexual reproduction involving Gametes of the same size " For example, in zygomycetes, two gametangia (single cells at the end of hyphae) form upon contact with each other and fuse into a zygote. Zygomycota, or zygote fungi are a Phylum of fungi. The name of the phylum comes from zygosporangia, where resistant spherical spores are formed during A hypha (plural hyphae) is a long branching filamentous cell of a Fungus, and also of unrelated Actinobacteria. For other meanings see Zygote (disambiguation. A zygote (from Greek ζυγωτός zugōtos "joined" or "yoked"
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic