cell-division with rejuvenescence forms the spores of mosses and higher cryptogams.
In other words we have here a process of cell-union before we have the cell-division which follows.
In the act of cell-division the nuclei of the resulting cells are formed from the nucleus of the primitive cell.
It grows by cell-division, the cell dividing into four, eight, or sixteen parts on a quaternary scale.
This form of cell-division is known as simple or direct division.
It was, however, many years before the details of this “cell-division” were laid bare (see cell-division below).
The process of cell-division, whereby the germ-cells or gametes are made, is called gameto-genesis.
It was, however, many years before the details of the growth and reproduction of the cells (cell-division) became well understood.
The spore produces the small green prothallium by cell-division in the usual way, and this completes the cycle of fern life.
In some cases of cell-division a remnant of the old nucleus is stated to be visible after the fresh nuclei have appeared.
cell division n.
The process by which a cell divides to form two daughter cells, each of which contains the same genetic material as the original cell and roughly half of its cytoplasm.
|cell division |
The process by which a cell divides into two or more cells. Among prokaryotes, cell division occurs by simple fission. Among eukaryotes, the cell nucleus divides first, and then a new cell membrane is formed between the nuclei to form the new cell. Cell division is used as a means of reproduction in organisms that reproduce asexually, as by fission or spore formation, and sexually reproducing organisms form gametes through cell division. Cell division is also the source of tissue growth and repair in multicellular organisms. The two types of cell division in eukaryotic organisms are mitosis and meiosis.