Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.
- noun The first stage of meiosis, constituted by a series of events that include the thickening and coiling of the chromosomes, synapsis of homologous chromosomes, tetrad formation, and crossing over.
from The Century Dictionary.
- noun In cytology, a preparatory stage in mitotic cell-division. The prophase is characterized by a more intense staining of the chromatin, the resolution of the reticulum into a skein or spireme, the breaking up of the latter into chromosomes, the appearance of the achromatic spindle, and the disappearance of the nuclear wall. The prophase is succeeded by the metaphase.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun the first stage of
mitosis , during whichchromatin condenses to form thechromosomes - noun the first stage of
meiosis
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the first stage of mitosis
- noun the first stage of meiosis
Etymologies
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Examples
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Prophase - The first stage of mitosis is known as prophase, where the nuclear chromatin starts to become organized and condenses into thick strands that eventually become chromosomes observable in the optical microscope (Figure 1 (b)).
unknown title 2009
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Diagrams of late prophase chromosomes (1000-band stage) of human, chimpanzee, gorilla, and orangutan (left to right for each number).
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A crossover at the meiotic prophase, as shown in Fig. 2, produces a dicentric chromosome that simulates two normal chromosomes attached together at the ends of their short arms, and a fragement chromosome with telomeres at both ends.
Nobel Lecture The Significance of Responses of the Genome to Challenge 1983
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This is before the nucleolus breaks up, which it does at a later stage in the first meiotic prophase.
Nobel Lecture The Significance of Responses of the Genome to Challenge 1983
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Its "epigenesis" is shown to be a literary example of the phases of cell division, with discussions of its prophase, metaphase, anaphase, and telophase.
The Dream of Mind and Machine Rothstein, Edward 1979
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Even in the middle of the twentieth century, textbooks and teachers could still be found perpetuating this error, in spite of the fact that a careful look at Flemming's own figures of nuclei in early prophase shows quite clearly that more than two chromosome ends are apparent in various prophase nuclei!
GENETIC CONTINUITY BENTLEY GLASS 1968
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This conception, which was based simply on inadequate observations of the number of free chromosome ends in the early prophase nuclei, was less in conflict with any of the principles of genet - ics, and had a much longer life.
GENETIC CONTINUITY BENTLEY GLASS 1968
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I to III, prophase; IV, metaphase; V and VI, anaphase; VII and VIII, telophase.
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I to III, prophase; IV, metaphase; V and VI, anaphase; VII and VIII, telophase.
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• These factors prevent primary oocytes from maturing beyond the prophase of the 1st meiotic division.
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