Why do we need cellular division?
Mitosis is the process through which cells can make copies of themselves. Why do they do that?
For several reasons:
1. When multicellular organisms (either plants or animals) want to GROW
2. When multicellular organisms need to REPLACE cells that have been damaged
3. When an unicellular organism wants to REPRODUCE (ASEXUAL REPRODUCTION)
To do this a cell has to:
a. make copies of its DNA
b. divide DNA in a correct way so that each DAUGHTER cell has the same DNA as the original MOTHER cell
So, when a human cell divides, MOTHER and DAUGHTER cell has the same number of chromosomes, which is 46. They are both diploid cells because each cell has the same information two times! This means that between point a and point b we will have a cell with 4-time the same information!
Why do we need mitosis? TEST
- When we grow it is because cells are becoming bigger
- When we grow it is because cells are dividing
- If we cut ourselves, our skin cells can replace damaged cells with mitosis
- Asexual reproduction does not need mitosis
- a human diploid cell has 23 chromosomes
- after mitosis we have two different cells with different genetic information