| 单词 | prophase |
| 例句 | The oogonia produce primary oocytes that are arrested in prophase I of meiosis from the time of birth until puberty. Fundamentals of Biology 2015-01-01T00:00:00Z Figure 6.4 Animal cell mitosis is divided into five stages—prophase, prometaphase, metaphase, anaphase, and telophase—visualized here by light microscopy with fluorescence. Concepts of Biology 2013-04-25T00:00:00Z Thus, meiosis I is the first round of meiotic division and consists of prophase I, prometaphase I, and so on. Biology for AP Courses 2022-06-09T00:00:00Z As cells enter prophase II, their chromosomes— each consisting of two chromatids—become visible. Miller & Levine Biology 2018-01-01T00:00:00Z A major occurrence during prophase concerns a very important structure that contains the origin site for microtubule growth. Anatomy and Physiology 2013-06-19T00:00:00Z The prophase covers all changes up to the completion of the mitotic figure. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z During prophase, the “first phase,” several events must occur to provide access to the chromosomes in the nucleus. Concepts of Biology 2013-04-25T00:00:00Z This prepares the cell to enter prophase I, the first meiotic phase. Biology for AP Courses 2022-06-09T00:00:00Z Mitosis is divided into four phases: prophase, metaphase, anaphase, and telophase. Miller & Levine Biology 2018-01-01T00:00:00Z Near the end of prophase there is an invasion of the nuclear area by microtubules from the mitotic spindle. Anatomy and Physiology 2013-06-19T00:00:00Z In each case the tetrads are formed by the double longitudinal splitting of the chromosomes, the latter appearing in the prophase in the reduced number. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z During prometaphase, many processes that were begun in prophase continue to advance and culminate in the formation of a connection between the chromosomes and cytoskeleton. Concepts of Biology 2013-04-25T00:00:00Z Figure 11.2 Early in prophase I, homologous chromosomes come together to form a synapse. Biology for AP Courses 2022-06-09T00:00:00Z At the beginning of prophase, the sister chromatids, or strands of condensed chromosomes, become visible. Miller & Levine Biology 2018-01-01T00:00:00Z This stage is referred to as late prophase or “prometaphase” to indicate the transition between prophase and metaphase. Anatomy and Physiology 2013-06-19T00:00:00Z The first division is thus a reducing division, while the split appearing in the anaphase of the heterotype and presumably reappearing in the prophase of the homotype is the original split of the spireme thread. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z In prophase II, if the chromosomes decondensed in telophase I, they condense again. Concepts of Biology 2013-04-25T00:00:00Z As prophase I progresses, the synaptonemal complex begins to break down and the chromosomes begin to condense. Biology for AP Courses 2022-06-09T00:00:00Z The genetic material inside the nucleus condenses and the duplicate chromosomes become visible during the first stage of mitosis called prophase. Miller & Levine Biology 2018-01-01T00:00:00Z Figure 145 is a prophase showing the bivalent chromosomes still connected by linin fibers. Studies in Spermatogenesis Part II Meiosis II, in which the second round of meiotic division takes place in a way that is similar to mitosis, includes prophase II, prometaphase II, and so on. Concepts of Biology 2013-04-25T00:00:00Z During meiosis, variation in the daughter nuclei is introduced because of crossover in prophase I and random alignment at metaphase I. The cells that are produced by meiosis are genetically unique. Concepts of Biology 2013-04-25T00:00:00Z Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Biology for AP Courses 2022-06-09T00:00:00Z In prophase I of meiosis, each replicated chromosome pairs with its corresponding homologous chromosome. Miller & Levine Biology 2018-01-01T00:00:00Z As prophase I progresses, the close association between homologous chromosomes begins to break down, and the chromosomes continue to condense, although the homologous chromosomes remain attached to each other at chiasmata. Concepts of Biology 2013-04-25T00:00:00Z In prophase I, the homologous chromosomes are paired up and linked together. Biology for AP Courses 2022-06-09T00:00:00Z However, the meiotic division is arrested in its progress in the first prophase stage. Concepts of Biology 2013-04-25T00:00:00Z Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Biology for AP Courses 2022-06-09T00:00:00Z As prophase I ends, a spindle forms and attaches to each tetrad. Miller & Levine Biology 2018-01-01T00:00:00Z This cell will start the first meiotic division and be arrested in its progress in the first prophase stage. Biology for AP Courses 2022-06-09T00:00:00Z At the time of birth, all future eggs are in the prophase stage. Biology for AP Courses 2022-06-09T00:00:00Z Mitosis consists of five stages: prophase, prometaphase, metaphase, anaphase, and telophase. Concepts of Biology 2013-04-25T00:00:00Z Prophase II mimics prophase I. Metaphase I occurs when chromosomes appear in homologous pairs on the spindle. Biology for AP Courses 2022-06-09T00:00:00Z Meiosis II, in which the second round of meiotic division takes place, includes prophase II, prometaphase II, and so on. Biology for AP Courses 2022-06-09T00:00:00Z |
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