Prophase
prometaphase
In Prophase, the nuclear membrane disappears. In telophase, the nuclear membrane re-forms.
"scientist have not discovered WHY it happens"It does not matter if scientists have discovered it or not, but the nuclear membrane disappears during PROPHASEHope this helped!!!
The nuclear membrane reforms during late telophase of mitosis or meiosis, while the nucleolus reappears during interphase.
During prophase, the nuclear membrane and the nucleolus dissolve and disappear.
When the nucleus disappears during prophase, it fragments into vesicles containing membrane and nuclear pore proteins. These vesicles then fuse together to reform the nucleus during telophase.
This is related to mitosis. Once the chromosomes are fully condensed, the nuclear envelop is disolved in order to let the mitotic spindle is put in it's place to migrate the chromatids to the poles. Once the chromatids have already migrated, the cytokinesis process take place, dividing the cell into two daughter cells that eventually rebuild their nuclear envelop.
Disappears in prophase and reappears in telophase.
The nuclear membrane completely disappears during prophase of mitosis. This stage is characterized by the condensation of chromatin into visible chromosomes and the breakdown of the nuclear envelope, allowing the spindle fibers to access the chromosomes. In meiosis, this also occurs during prophase I.
The double membrane surrounding the nucleus is called the nuclear envelope. It consists of an outer membrane and an inner membrane, with nuclear pores that control the movement of molecules in and out of the nucleus.
nuclear membrane
The nuclear membrane completely disappears during the prophase of mitosis. This phase marks the beginning of cell division, where chromatin condenses into visible chromosomes and the nuclear envelope disintegrates, allowing the spindle fibers to access the chromosomes. This process is crucial for the proper segregation of genetic material to the daughter cells.