The eukaryotic cell cycle includes four phases necessary for proper growth ... These checkpoints ensure that mitosis occurs only when environmental conditions are favorable and the cellular ...

Each nucleus now contains four chromosomes (two sets of two ... It can be seen in the stages shown above that mitosis maintains the chromosome number or complement of a cell.

Interphase The cell spends most of its life in this phase. The DNA in chromosomes copies itself ready for mitosis. Prophase The DNA in chromosomes and their copies condenses to become more visible.

Same as in mitosis, except that the spindle fibers from ... other centriole attach to the other 23 chromosomes. (Again, only four chromosomes are shown here in order to simplify the illustration.) ...

Like mitosis, meiosis is a form of eukaryotic ... Meiosis I consists of four phases: prophase I, metaphase I, anaphase I, and telophase I. During prophase I, the chromosomes condense and become ...

Same as in mitosis, except that the spindle fibers from ... other centriole attach to the other 23 chromosomes. (Again, only four chromosomes are shown here in order to simplify the illustration.) ...