Cell CyclesChromosomes and chromatin structureMitosisMeiosisEukaryotic Gene and Gene Expression |
Cell is the fundamental unit .According to Cell theory Cell develop from preexisting cell, formation of new cell from preexisting cell is called Cell Division that means parent cell divide into two or more daughter cells .
Multi-cellular organisms and unicellular organisms shows different types of cell divisions. Cells may divide for several reasons, and there are two types of cell division depending on the purpose. The cell division associated with Germ cells is called meiosis. The other type, the cell division associated with somatic cells (growth and cell replacement or repair,) is called mitosis. In both types of cell division, the nucleus splits and DNA is replicated. cell division means not only splitting of nucleus means replication of chromosomes ,cell membrane and cytoplasm also divide ,this process called as cytokinesis .cytokinesis occur immediately after mitotic or meiosis cell division.
Cell division usually occurs as part of a larger cell cycle. In Eukarotic cell division is two different types vegetative( somatic) cell reproduction and reproductive cells, Somatic cells produces same type of daughter cells that means cells are identical to parent it is because both are having same genetical material (chromosomes) .
In case of Germ cells ( reproductive cells) produces haploid gamete which is fuses with other gamete produces new offspring.
The above two types of cell divisions are in eukarytes . Both types of cell division are sexual reproduction .
In prokryotes cell division is by asexual method is binary fusion in this process parent cell divide into two daughter cells . cell division can not stops the with the formation of mature organism ,it is continues through out life .The stages cell passes from one division to other division is called cell cycles
