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  1. Cleavage

    Embryo

    In embryology, cleavage is the division of cells in the early development of the embryo, following fertilization. The zygotes of many species undergo rapid cell cycles with no significant overall growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called the morula. Cleavage ends with the formation of the blastula, or of the blastocyst in mammals. Depending mostly on the concentration of yolk in the egg, the cleavage can be holoblastic or meroblastic. The pole of the egg with the highest concentration of yolk is referred to as the vegetal pole while the opposite is referred to as the animal pole. Cleavage differs from other forms of cell division in that it increases the number of cells and nuclear mass without increasing the cytoplasmic mass. Wikipedia

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  2. en.wikipedia.org

    In embryology, cleavage is the division of cells in the early development of the embryo, following fertilization. [1] The zygotes of many species undergo rapid cell cycles with no significant overall growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called the morula.
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  4. biologynotesonline.com

    Apr 12, 2024Cell Division: Cleavage involves the rapid division of the fertilized egg through mitosis. These repeated divisions give rise to numerous cells known as blastomeres. Morula Formation: In certain animals, such as mammals, cleavage leads to the formation of a solid mass of cells called the morula. The morula is a compact cluster of blastomeres.
  5. biologydiscussion.com

    Cleavage consists of division of the zygote into a large number of cel­lular entities. The cells which are produc­ed during segmentation are called blastomeres. At first, the cells remain closely asso­ciated, but later on they form the lining of a hollow sphere called blastula. The blastula contains a cavity named blastocoel and its outer ...
  6. bio.libretexts.org

    Nov 23, 2024Cleavage and Blastula Stage. The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form the blastula. The rapid, multiple rounds of cell division are termed cleavage. After the cleavage has produced over 100 cells, the embryo is called a blastula.
  7. britannica.com

    Cleavage, in embryology, the first few cellular divisions of a zygote (fertilized egg). Initially, the zygote splits along a longitudinal plane. The second division is also longitudinal, but at 90 degrees to the plane of the first. The third division is perpendicular to the first two and is
    Author:The Editors of Encyclopaedia Britannica
  8. ncbi.nlm.nih.gov

    National Center for Biotechnology Information

    https://www.ncbi.nlm.nih.gov › books › NBK9992

    Cleavage. After fertilization, the development of a multicellular organism proceeds by a process called cleavage, a series of mitotic divisions whereby the enormous volume of egg cytoplasm is divided into numerous smaller, nucleated cells.These cleavage-stage cells are called blastomeres.In most species (mammals being the chief exception), the rate of cell division and the placement of the ...
  9. organismalbio.biosci.gatech.edu

    Development Step 2: Cleavage and Blastula Stage. After fertilization activates the egg, the egg begins a series of rapid cell divisions called cleavage, illustrated below.Typical, non-cleavage cell division occurs every 18-24 hours, but cleavage cell divisions can occur as frequently as every 10 minutes.During cleavage, the cells divide without growing between divisions, so the large single ...
  10. epomedicine.com

    Following events occur in the zygote formed in the week zero of development:. Cleavage. Approximately 24 hours after fertilization the zygote begins with the first cleavage division. Series of mitotic divisions of the zygote (occurs in fallopian tube) to form small daughter cells called blastomeres.; Characteristics of cleavage in humans:
  11. med.libretexts.org

    Key Terms. cleavage: In embryology, this is the division of cells in the early embryo.; trophoblast: The membrane of cells that forms the wall of a blastocyst during early pregnancy and provides nutrients to the embryo, and later develops into part of the placenta.; zygote: A fertilized egg cell.; morula: A spherical mass of blastomeres that forms following the splitting of a zygote; it ...
  12. citycollegekolkata.org

    cleavage in frog's egg was studied by Prevost and Dumas in 1824. With the development of microscopes cleavages and further stages were observed in the eggs of sea urchin, star fishes, amphioxus and hen's eggs. From all these studies it has become clear that all divisions in cleavage are mitotic. The mitotic process is very rapid.

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