In which two phases of mitosis does the nuclear membrane appear or disappear?
Micrographs illustrating the progressive stages of mitosis in a plant cell. During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down. At metaphase, the condensed chromosomes (more…)
In which of the stage of mitosis cell division does the nuclear membrane disappear?
During metaphase, the nuclear membrane disappears and the chromosomes become aligned half way between the centrioles.
In which phase do the spindle fibers disappear?
telophase
During telophase, chromosomes arrive at opposite poles and unwind into thin strands of DNA, the spindle fibers disappear, and the nuclear membrane reappears.
Why does the nuclear membrane disappear during mitosis?
Protein tubes called microtubules connect the chromosomes that align in the middle during metaphase to opposite ends of the dividing cell. Microtubules are like ropes that will pull the chromosomes apart. The connection of microtubules to chromosomes is why the nuclear envelope needed to be broken down during prophase.
Which cell organelles disappear by the end of prophase?
During prophase the chromosomes separate from one another, and so the nucleolus disappears. The nuclear membrane and nucleolus both disappear during prophase of mitosis and meiosis.
During which phase do chromosome first become visible?
prophase
In the first stage, prophase, each chromosome becomes condensed and more visible, and there is the breakdown of the nuclear membrane and appearance of spindle fibers. In the next phase, metaphase, the chromosomes line up along the metaphasic plate.
What process is absent in interphase?
Interphase is a phase of the cell cycle, defined only by the absence of cell division. During interphase, the cell obtains nutrients, and duplicates (copies) its chromatids (genetic material). The genetic material or chromatids are located in the nucleus of the cell and are made of the molecule DNA.
During what phase do chromosomes first become visible?
What phases is the nuclear envelope absent?
It remains absent through the duration of mitosis until it begins to reassemble during telophase. The nuclear membrane is thus absent during prophase, metaphase, and telophase.