What is the G2 phase (growth phase 2) primarily focused on?

• A. DNA replication.
• B. Direct preparation for mitosis and microtubule formation.
• C. Cytokinesis.
• D. Cell growth with no preparation for division.

Answer: (B)

G2 is the final growth and preparation stage before cell division, with a focus on gearing up for mitosis. After DNA has been replicated, the cell increases in size and builds the components needed for chromosome separation, especially the mitotic spindle made of microtubules. That preparation includes producing tubulin and other proteins, organizing centrosomes, and ensuring there is enough energy and organelles to support division. DNA replication happened earlier in S phase, so this stage isn’t about copying DNA. Cytokinesis happens later, during the end of M phase, not in G2. While the cell continues to grow, the key feature of G2 is readying the cell for mitosis, particularly spindle formation for accurate chromosome separation.