chromosomes in the parent and the daughter (Progeny) cells remain the same so it is also called as equational division . . . Closed and Open Mitosis In closed mitosis, the nuclear envelope remains intact and chromosomes migrate to opposite poles of a spindle within the nucleus (Figure .
). Example: Many single celled eukaryotes including yeast and slime molds. In open mitosis, the nuclear envelope breaks down and then reforms around the sets of separated chromosome. Example: Most plants and animals • Some animals are able to regenerate whole parts of the body.
decondense. In plants, phragmoplast are formed between the daughter cells. Cell plate is formed between the two daughter cells, reconstruction of cell wall takes place. Finally cells are separated by the distribution of organelles, macromolecules into two newly formed daughter cells.
. . Cytokinesis Cytokinesis in Animal Cells It is a contractile process. The ring consists of a bundle of microfilaments assembled from actin and myosin .
This fibril generates a contractile force, that draws the ring inward forming a cleavage furrow in the cell. Thus it divides the cell into two. Check your grasp! What effect does mitosis have on transcription?
During mitosis transcription stops. Cytokinesis in Plant Cell Division of the cytoplasm often starts during telophase. In plants, cell plate grows from centre towards lateral walls. Phragmoplast contains microtubules, actin filaments and vesicles from golgi apparatus and ER.
Microtubule of the pharagmoplast move to the equator, fuse to form a new plasma membrane and the materials which are placed into compact group at the equator of the cell is known as metaphase plate . This is the stage where the chromosomal morphology can be easily studied. Kinetochore is a DNA–Protein complex present at the centromere where microtubules are attached. It is a trilaminar disc like plate.
Figure . : Anaphase promoting complex cyclosome Anaphase Each chromosome splits simultaneously and two daughter chromatids begin to migrate towards two opposite poles of a cell. Each centromere splits longitudinally into two, freeing the two sister chromatids from each other. When sister chromatids separate the