The G1 phase is part of interphase within the cell cycle during which cellular content excluding chromosomes gets duplicated.
Imagine G1 phase as shopping for ingredients before cooking a meal. You're preparing and gathering everything you need (except the recipe itself) to make the dish.
S Phase: This is the part of the cell cycle where DNA replication occurs, similar to reading and understanding your recipe in our analogy.
G0 Phase: This is a period in the cell cycle in which cells exist in a quiescent state, like deciding not to cook after all.
G2 Phase: This phase involves further growth and preparation for mitosis - akin to prepping your cooking utensils and preheating your oven.
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