G1 checkpoint is near the end of G1 (close to the G1/S transition). G2 checkpoint is near the end of G2 (close to the G2/M transition). Spindle checkpoint is partway through M phase, and more specifically, at the metaphase/anaphase transition.
Mitosis, also known as the M phase, is the process of making two identical daughter cells through cytokinesis and nuclear division. Two daughter cells that are diploid are created as a result of cell division and mitosis (M). M phase refers to either mitosis or cell division (also known as cytokinesis), whereas G1, S, and G2 refer to the other three stages.
A stage of cell division is called metaphase (mitosis or meiosis). Typically, each chromosome is dispersed throughout the cell nucleus. In metaphase the process of dividing, a cell's chromosomes compress and travel toward the center while the nucleus disintegrates.
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