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Prophase is the first step of cell division in mitosis. As it occurs after G2 of interphase, DNA has been already replicated when prophase begins. Fluorescence microscope image of two mouse cell nuclei in prophase (scale bar is 5 μm).
- What phase does prophase occur in?
- What stage of mitosis is prophase?
- What major event occurs during prophase?
- Does prophase happen before mitosis?
- In what order do events occur during mitosis?
- During what phase does cytokinesis begin?
- Which of the following events does not occur during prophase?
- Which of the following occur during prophase prometaphase of mitosis in animal cells?
- What happens in the 4 stages of mitosis?
- What other changes occur during prophase?
- What happens during the Prometaphase?
- Which of the following events must occur prior to the start of mitosis?
- In what phase does G1 occur?
- Which of the following occurs during S phase?
What phase does prophase occur in?
Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase.
What stage of mitosis is prophase?
Prophase is the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses.
What major event occurs during prophase?
During prophase, the chromosomes condense and centrosomes move to opposite sides of the nucleus, initiating formation of the mitotic spindle. Breakdown of the nuclear envelope then allows spindle microtubules to attach (more...)
Does prophase happen before mitosis?
Prophase is the first step of mitosis. This is when the genetic fibers within the cell's nucleus, known as chromatin, begin to condense and become tightly compacted together.
In what order do events occur during mitosis?
Explanation: Mitosis has four sequential stages: prophase, metaphase, anaphase, and telophase. In prophase, each chromosome becomes condensed and more visible, and there is the breakdown of the nuclear membrane and appearance of spindle fibers.
During what phase does cytokinesis begin?
Cytokinesis starts during the nuclear division phase called anaphase and continues through telophase. A ring of protein filaments called the contractile ring forms around the equator of the cell just beneath the plasma membrane.
Which of the following events does not occur during prophase?
E) Homologous pairs of chromosomes align at the metaphase plate does not occur during prophase I of meiosis.
Which of the following occur during prophase prometaphase of mitosis in animal cells?
The correct answer is d.)
The replication of chromosomes occurs in interphase of mitotic division. The 2N chromosomes change into 4N chromosomes to indicate that the cell is ready for division. Prometaphase is the late stage of prophase and early stage of interphase. All other options are applicable to prometaphase.
What happens in the 4 stages of mitosis?
1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope ...
What other changes occur during prophase?
During prophase the nucleoli disappear and the chromatin fibers thicken and shorten to form discrete chromosomes visible with the light microscope. Each replicated chromosome appears as two identical chromatids joined at the centromere.
What happens during the Prometaphase?
During prometaphase, the physical barrier that encloses the nucleus, called the nuclear envelope, breaks down. The breakdown of the nuclear envelope frees the sister chromatids from the nucleus, which is necessary for separating the nuclear material into two cells.
Which of the following events must occur prior to the start of mitosis?
What must happen before a cell can begin mitosis? The chromosomes must be duplicated, which occurs during interphase. ... Metaphase occurs in the middle of mitosis, when the chromosomes line up in the middle of the cell.
In what phase does G1 occur?
G1 is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during S phase. During this time, the cell grows in preparation for DNA replication, and certain intracellular components, such as the centrosomes undergo replication.
Which of the following occurs during S phase?
Which of the following is a function of the S phase in the cell cycle? The synthesis of sister chromatids, DNA replication occurs during S phase and results in two sister chromatids for each original chromosome. ... Chromosomes must undergo replication before mitosis can occur; this copying occurs during the S phase.
