Draw the Cell Cycle Diagram. • Basic pie chart with stages of interphase, mitosis, and cytokinesis (draw in the center of page) • Add the chromosome number before and after s phase of interphase • Add the chromatid number for each stage before and after s phase of interphase • Add the 3 checkpoints and the name of a main tumor suppressor gene
The Correct Answer and Explanation is:
Your cell cycle diagram is being generated now.
The cell cycle consists of a series of events that allow cells to grow, replicate their DNA, and divide. It is composed of interphase (G1, S, and G2 phases), mitosis, and cytokinesis.
Interphase is the longest stage, where the cell prepares for division. In the G1 phase, the cell grows and carries out metabolic activities, with 46 chromosomes in a diploid human cell. The S phase follows, during which DNA replication occurs, doubling the chromatids to 92 while maintaining 46 chromosomes. The G2 phase involves further growth and preparation for mitosis.
Mitosis is divided into prophase, metaphase, anaphase, and telophase. During prophase, chromatin condenses, and spindle fibers form. By metaphase, chromosomes align at the equator. Anaphase sees sister chromatids pulled apart, reducing the chromatid count back to 46. In telophase, nuclear membranes reassemble, and the cytoplasm begins division. Finally, cytokinesis completes the process, splitting the cell into two identical daughter cells, each with 46 chromosomes.
Three key checkpoints regulate the cycle:
- G1 checkpoint ensures sufficient cell size and DNA integrity.
- G2 checkpoint verifies DNA replication accuracy before mitosis.
- M checkpoint monitors chromosome attachment to spindle fibers.
A critical tumor suppressor gene, p53, halts the cycle if DNA damage is detected, preventing uncontrolled growth.
This system ensures genomic stability, preventing mutations that may lead to cancer. The balance between cell proliferation and regulation is vital for healthy tissue maintenance. Your diagram visually represents these stages and checkpoints in a structured format.
