| Oogonium | |
|---|---|
| Gray's | subject #3 38 |
| MeSH | Oogonia |
An oogonium (plural oogonia) is an immature ovum. the Animal cell ( Embryology Ontogeny Phylogeny Ovum Medical Subject Headings ( MeSH) is a huge Controlled vocabulary (or metadata system for the purpose of indexing journal articles and books An immature ovum is a cell that goes through the process of Oogenesis to become an Ovum. It is a female gametogonium. A gametogonium (plural gametogonia) is a Germ cell that divides into Gametocytes during Gametogenesis. They are formed in large numbers by mitosis early in fetal life from primordial germ cells, which are present in the fetus between weeks 4 and 8. Mitosis is the process in which a Eukaryotic cell separates the Chromosomes in its Cell nucleus, into two identical sets in two daughter nuclei A fetus (or foetus or fœtus) is a developing Mammal or other Viviparous Vertebrate, after the Embryonic stage and Germ cells are progenitors of the Gametes. These singled out cells move through the gut to the developing Gonads and undergo mitotic proliferation followed
Oogonia are present in the fetus between weeks 5 and 30.
Oogonia are also the female reproductive structures in certain thallophytes, and are usually rounded cells or sacs containing one or more oospheres. The thallophytes are a Polyphyletic group of non-mobile Organisms traditionally described as " relatively simple Plants " or " 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 An ovum (plural ova) is a Haploid Female reproductive cell or Gamete.
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Further development
Once the primordial germ cells have gotten to the ovary, they develop into oogonia. Oogenesis or rarely oögenesis is the creation of an Ovum (egg cell Germ cells are progenitors of the Gametes. These singled out cells move through the gut to the developing Gonads and undergo mitotic proliferation followed "Ovaria" redirects here This is also a proposed section and a Synonym of Solanum. During week 6 of development, oogonia migrate from the yolk sac to the genital ridge ( site of the future gonads-ovaries in this case) located on the posterior abdominal wall. Oogonia develop by mitosis. Mitosis is the process in which a Eukaryotic cell separates the Chromosomes in its Cell nucleus, into two identical sets in two daughter nuclei However, some of them become primary oocytes, which begin meiosis which is halted in prophase I. An oocyte, ovocyte, or rarely ocyte, is a female Gametocyte or Germ cell involved in reproduction. 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 When they have entered Prophase I of meiosis they become primary oocytes; it is important to note that this process is complete before birth, in contrast to spermatogenesis. An oocyte, ovocyte, or rarely ocyte, is a female Gametocyte or Germ cell involved in reproduction. Spermatogenesis is the process by which male Spermatogonia develop into mature Spermatozoa. Primary oocytes are present from week 10 until menopause at ~53 years
Oogamy
Oogamy may be spelt oögamy with a diaresis (or umlaut). The link with other articles may depend on this symbol.
Oogonia
Algae
This term is used in phycology (the study of algae) to refer to the union of the male (motile or non-motile) with the female gamete. Phycology (from Greek grc φύκος phykos, "seaweed" and grc -λογία -logia) or algology (from Latin A gamete (from Ancient Greek γαμέτης; translated gamete = wife gametes = husband is a cell that fuses with another gamete [1]The female oogonium is usually enlarged and develops a single ovum. The male (antheridium) usually produces many cells with flagella except in the Rhodophyta which have no flagella. The red algae (Rhodophyta ˌroʊdəˈfaɪtə roʊˈdɒfɨtə from Greek: ῥόδον (rhodon = rose + φυτόν (phyton = plant thus red plant are [2] There is no evidence that the red algae ever had flagella, or cilia and it is suggested that they are the most primitive eukaryotes. Animals Plants fungi, and Protists are eukaryotes (juːˈkærɪɒt or -oʊt Organisms whose cells are organized into complex [3]
Fungi
Oogonia also occur in the fungi. A fungus (ˈfʌŋgəs is a eukaryotic Organism that is a member of the kingdom Fungi (ˈfʌndʒaɪ [4]
References
- ^ Stegenga, H. Bolton, J. J. and Anderson, R. J. 1997. Seaweeds of the South African West Coast. Bolus Herbarium, University of Cape Tow. ISBN 0 7992 1793 X
- ^ Fritsch, F. E. 1965. The Structure and Reproduction of the Algae. Vol. 1 Cambridge University Press
- ^ Cole, K. M. and Sheath, R. G. (Eds) 1990. Biology of Red Algae. Cambridge University Press. ISBN 0 521 34301 1
- ^ Smyth, G. M. 1955. Cryptogamic Botany. vol. 1. McGraw-Hill Book Company
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