Bio questions about the cell cycle?

Cells divide , Good visions start as a single cell. (one cell in twins SPLITS),where fertilization takes place in two cells..Haploid refers to Genetics and certain ,chromosome codes for the individual cell.. This is extensive in nature ..Before cell division. a cell does not divide, as a healthy cell w/o a exact match of chromosomes defining a cell. Enviormental,or chemical,reaction can produce a cell cancerous or mutated. The cell upon division transfers an exact match of diploid, chromosomes to its division. .Mitosis is the stage of copy,complete transfer of the .genetic code of chrmosomes in the nucleus,of the cell,before it splits.. Im not a biology major but this seems to be what I remember.