what is the main difference between metaphase 1 and 2?
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What is the difference between Metaphase 1 and Metaphase 2? In Metaphase I, the 'pairs of chromosomes' are arranged on the Metaphase plate while, in the Metaphase II, the 'chromosomes' are arranged on the metaphase plate. In Metaphase I, the spindle fibers get attached to two centromeres of each homologous chromosome.
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One significant difference between growth phases is that the first growth phase is about cell growth while G2 is about cell division.
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The cell cycle has two major phases: interphase and the mitotic phase (Figure 1). During interphase, the cell grows and DNA is replicated. During the mitotic phase, the replicated DNA and cytoplasmic contents are separated, and the cell divides.
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Similarly, in humans (2n=46), there are 46 chromosomes present during metaphase, but 92 chromatids. It is only when sister chromatids separate – a step signaling that anaphase has begun – that each chromatid is considered a separate, individual chromosome.
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During telophase 1, the movement of separated homologous chromosomes is completed to the opposite poles of the cell. During telophase 2, the movement of sister chromatids is completed to the opposite pole of the cell. ... Therefore, the main difference between telophase 1 and 2 is the events occurring in each step.
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Anaphase1:Twospindlefibersareattachedtothecentromereoftheeachchromosomeinthehomologouspair. Anaphase2:Twospindlefibersareattachedtothesamecentromereofasinglechromosome. Anaphase1:Homologouschromosomesareseparatedduringanaphase1.
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In eukaryotic cells, or cells with a nucleus, the stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase.
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In anaphase I, the homologous chromosomes are separated. In prometaphase II, microtubules attach to the kinetochores of sister chromatids, and the sister chromatids are arranged at the midpoint of the cells in metaphase II. In anaphase II, the sister chromatids are separated.
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In meiosis 1, a diploid cell becomes 2 haploid (23 chromosomes) daughter cells, each chromosome has two chromatids. One cell becomes the secondary oocyte the other cell forms the first polar body. The secondary oocyte then commences meiosis 2 which arrests at metaphase and will not continue without fertilization.
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Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells.
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S phase (DNA Synthesis) - Each of the 46 chromosomes are duplicated by the cell. III. G2 phase (Gap 2) - The Cell “double checks” the duplicated chromosomes for error, making any needed repair.
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Meiosis is preceded by interphase which consists of the G1 phase (growth), the S phase ( DNA replication), and the G2 phase. During prophase I, the homologous chromosomes condense and become visible as the x shape we know, pair up to form a tetrad, and exchange genetic material by crossing over.
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The difference is that in Metaphase-1 of meiosis the chromosome arrange in two pair wise (synapsis) and therfore cross over takes place while in mitosis the chromosome arrange in single pair and no cross over takes place.
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In the anaphase I, homologous chromosomes (bivalent) separate to opposite poles, retaining sister chromatids together, whereas anaphase II chromatids of a chromosome separate to opposite poles, splitting the centromere.
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The cell cycle has two general phases. Interphase is the preparation phase before cell division, and mitosis the phase in which the dividing happens. ... This makes sense since centromeres are part of chromosomes and chromosomes are S phase is the part of interphase when DNA duplication takes place.
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The cell cycle has two major phases: interphase and the mitotic phase (Figure 1). During interphase, the cell grows and DNA is replicated. During the mitotic phase, the replicated DNA and cytoplasmic contents are separated, and the cell divides. Figure 1.
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Both Meiosis I and II have the same number and arrangement of phases: prophase, metaphase, anaphase, and telophase. Both produce two daughter cells from each parent cell. However, Meiosis I begins with one diploid parent cell and ends with two haploid daughter cells, halving the number of chromosomes in each cell.