Welcome back students, let's get to discuss another important topic that is mitosis and also it is called as the cell cycle. Now mitosis is a type of cell division in which the cell divides to form two dotasins retaining the same chromosome number complement. It ensures the equal distribution of genetic material and it is a process in which the division of nucleus and side to plasm occurs only once. As you can see here, one cell gets divided into two dotasins. Now the somatic cell division is observed in the mitosis. Here somatic cells have produced, somatic cells means the body cells, that means leaving the germ cells or you can say the sex cells. Somatic cells have 46 chromosomes, that means 43 pair of chromosomes. They are homologous in nature, that means each pair has a chromosome, pair homologous form is present. Next, it is deployed in nature, that means total 46 chromosomes in the cell is present, which forms aicute and the somatic cells. Next comes the haploid cells. The haploid cells have total 23 chromosomes, which have the gametes, sparms and eggs. So haploid cells are basically the gametes, that you can say the germ cells. While haploid cells are the cells which have zygote, zygotic cells as well as the somatic cells. Now let us start with the cell cycle. The sequence of growth and division of a cell includes the cell cycle. The 95% of the cell cycle occurs in the interface of a cell and 5% of the cell cycle is observed in the mitosis division. Now basically a series of changes or sequential events which occur in the life of dividing cell is called as cell division. Let us see the first phase of mitosis. The first phase includes the G1 phase, which is also called as the first growth phase and so called as post-mitotic gap phase. So here the metabolic activity of the cell starts. Next is the S stage that is also called as the synthesis stage or synthesis, synthetic phase. Here basically the replication of DNA takes place during the stage and entire genetic material or DNA duplicates. Next comes the G2 phase which is again the growth stage. It is a second growth phase and also called as pre-mitotic gap or growth phase. This includes the synthesis of tubulin, the spindle protein and the RNA as well as the metabolic activity of cell takes place and the cell prepares for the division. This comes the basic mitotic cell in that is mitosis happens in all cells and cell division processes taking place basically in mitosis and there are major 5 steps. So before mitosis starts in cell cycle, interface is mainly observed in this interface G1, S and G2 phases observed where what happens. First growth phase is observed, first growth or it is in the post-mitotic gap phase is there. It involves the synthesis of proteins and enzymes and energy molecules required for the DNA replication. Next comes the S phase, S phase that means phase of synthesis where replication of DNA takes place during the stage and entire DNA material duplicates. Next comes the G2 phase which is the second growth phase and it is called as a pre-mitotic gap or the growth phase. The students in this session we have seen about the interface or you can say the starting of mitosis and further session we will have more discussion on the further stages of mitosis. Thank you.