During which phase of mitosis are chromosomes most clearly visible under a microscope?

• A. Interphase
• B. Telophase
• C. Cytokinesis
• D. Prophase

Answer: (D)

Verified step by step guidance

1. Understand the stages of mitosis: Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct characteristics and roles in cell division.
2. Recognize the characteristics of prophase: During prophase, the chromatin condenses into visible chromosomes. This is the first stage where chromosomes become distinct and visible under a microscope.
3. Compare visibility of chromosomes in different phases: In interphase, chromosomes are not visible as they are in the form of chromatin. During telophase, chromosomes begin to de-condense, making them less visible. Cytokinesis is the process of cytoplasmic division and does not involve changes in chromosome visibility.
4. Identify the phase with the most visible chromosomes: Since prophase is the stage where chromatin condenses into visible chromosomes, it is the phase where chromosomes are most clearly visible under a microscope.
5. Conclude that prophase is the correct answer: Based on the characteristics of each phase, prophase is the phase during mitosis when chromosomes are most clearly visible under a microscope.