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Prophase


prophase
preparatory stage of cell division preceding metaphase
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Prophase is a cell cycle stage of mitosis in which chromatin condenses into a highly ordered structure called a chromosome. This process, called chromatin condensation, is mediated by condensin.
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Related Resources: Prophase
Prophase is a beautiful menagerie of changes that occur in both the cytoplasm and nucleus of a dividing cell.
Meiosis
Introduction to mitosis and the process of cell division.
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Prophase
Main article: Prophase
The genetic material (DNA), which normally exists in the form of chromatin condenses into a highly ordered structure called a chromosome.
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Prophase
Strasburger (1884) originally introduced this term for the early stage of nuclear division before (Gk. pro) the chromosomes divide into two chromatids, but from about 1905, ...
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Prophase of meiosis I (prophase I) is a more elaborate process than prophase of mitosis (and usually takes much longer).
Here is a brief overview of the process. A more detailed view is provided below.
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Prophase I
The events that occur during prophase of mitosis also occur during prophase I of meiosis. The chromosomes coil up, the nuclear membrane begins to disintegrate, and the centrosomes begin moving apart.
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Prophase of meiosis I occurs in morphologically distinguishable stages (above).
The width of the synaptonemal complex (SC), 200 nm between axial elements, is 100 X the width of a DNA helix.
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Prophase
chromatin coils up into short fat rods called chromosomes
nuclear envelop disappears
spindle fibers begin to form
nucleolus disappears ...
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Prophase I has a unique event -- the pairing (by an as yet undiscovered mechanism) of homologous chromosomes. Synapsis is the process of linking of the replicated homologous chromosomes.
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prophase: the first phase of mitosis; involves chromosomal condensation, nuclear membrane breakdown, and the migration of centrioles to opposite poles.
prophase I: the first phase of meiotic division, during which crossing over takes place.
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prophase
[Gk. pro, before + phasis, form]
The first stage of mitosis, during which duplicated chromosomes condense from chromatin, and the mitotic spindle forms and begins moving the chromosomes toward the center of the cell.
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prophase The stage of mitosis during which the chromosomes become visible under a light microscope. The first stage of mitosis during which the chromosomes are condensed but not yet attached to a mitotic spindle.
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During the prophase of meiosis I, homologous chromosomes pair and form synapses. The paired chromosomes are called bivalents. The bivalent has two chromosomes and four chromatids, with one chromosome coming from each parent.
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mitosis The multistep process (interphase, prophase, metaphase, anaphase, telophase) in eukaryotic cells that results in the replication of chromosomes and cell division.
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The third stage in prophase 1 of meiosis in which there is further shortening and thickening of the bivalents. The chromosomes split into chromatids, allowing crossing over to occur and hence the formation of chiasmata.
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MPF - maturation/mitosis promoting factor - heterodimeric protein that initiates prophase of mitosis and alters the activity of diverse proteins that function in mitosis by phosphorylation; ...
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A process of cell division in eukaryotic cells conventionally divided into the growth period (interphase) and four stages: prophase, metaphase, anaphase, and telophase.
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Prophase - phase of mitosis in which the chromatin duplicates itself and thickens into chromosomes, the spindle fibers form, and the nuclear membrane disintegrates ...
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The pairing of homologous chromosome pairs during prophase of the first meiotic division, when crossing over occurs. T Taq polymerase. A heat-stable DNA polymerase isolated from the bacterium Therrnus aquaticus, used in PCR.
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