Understanding the Cell Cycle: A Visual Guide

Interphase begins with G1, the first growth phase, where the cell increases in size and produces new proteins and organelles.During G1, the cell actively produces proteins and RNA, preparing for DNA replication.In S phase, the cell replicates its DNA, creating identical copies of each chromosome.Each DNA molecule unwinds and serves as a template for creating a new complementary strand.Finally, in G2 phase, the cell performs quality checks and makes final preparations for division.During G2, the cell continues to grow and duplicates its organelles to ensure each daughter cell will have what it needs.The G2 checkpoint ensures all DNA has been correctly replicated and the cell is ready to begin division.With preparations complete, the cell is ready to begin the complex process of division.During prophase, the chromosomes begin to condense and become visible under the microscope.The nuclear envelope breaks down, and spindle fibers start to form from the centrosomes.In metaphase, the chromosomes align at the cell's equator, forming what's called the metaphase plate.During anaphase, the sister chromatids are pulled apart toward opposite poles of the cell.Finally, in telophase, the nuclear envelopes reform around the separated chromosomes, which begin to decondense.During cytokinesis, animal and plant cells use different mechanisms to complete cell division.Animal cells form a cleavage furrow using a contractile ring of actin and myosin proteins.Plant cells, protected by their rigid cell wall, form a cell plate that grows outward from the center.In animal cells, the cleavage furrow gradually pinches the cell in two.Meanwhile, in plant cells, the cell plate forms in the middle and expands outward to meet the cell wall.In both cases, the process ensures each daughter cell receives equal portions of cellular components.With cytokinesis complete, two identical daughter cells are formed, each ready to begin their own cell cycles.Thanks for learning about cytokinesis with Spark.E!