Question

task 5: answer the questions below based using the interphase model from above. describe two events that occur during the interphase stage of the cell cycle. two events that occur in interphase are: • • explain why mitosis must occur before cytokinesis. mitosis must occur before cytokinesis because...

Explanation:

• For the first question: Interphase has three sub - phases. In the G₁ phase, the cell grows in size, synthesizes proteins and organelles. In the S phase, DNA replication occurs, doubling the amount of genetic material. In the G₂ phase, the cell continues to grow and prepares for mitosis by synthesizing proteins needed for cell division. So two events could be DNA replication (in S phase) and cell growth (in G₁ or G₂ phase).
• For the second question: Mitosis is the process of nuclear division. It ensures that each new cell gets a complete set of chromosomes (genetic material). Cytokinesis is the division of the cytoplasm. If cytokinesis occurred before mitosis, the distribution of genetic material to daughter cells would be random and likely result in cells with an incorrect number of chromosomes (which is often lethal or causes abnormal cell function). Mitosis first evenly distributes the replicated chromosomes into two nuclei, and then cytokinesis can divide the cytoplasm to form two genetically - identical daughter cells.

Answer:

• Two events that occur in interphase are: DNA replication (in the S phase) and cell growth (in the G₁ or G₂ phase).
• Mitosis must occur before cytokinesis because mitosis ensures the proper distribution of chromosomes (genetic material) to two nuclei. Cytokinesis then divides the cytoplasm to form two daughter cells. If cytokinesis occurred first, there would be no guarantee of an even distribution of genetic material to the daughter cells.