Which phase of mitosis is characterized by the condensation of chromosomes and the formation of spindle fibers?

• A. Anaphase
• B. Metaphase
• C. Telophase
• D. Prophase

Answer: (D)

Verified step by step guidance

1. Step 1: Begin by understanding the phases of mitosis. Mitosis is divided into several stages: Prophase, Metaphase, Anaphase, and Telophase. Each phase has distinct characteristics and functions.
2. Step 2: Focus on Prophase. During this phase, chromosomes condense and become visible under a microscope. This condensation is crucial for the chromosomes to be properly segregated later in mitosis.
3. Step 3: Learn about spindle fibers. In Prophase, spindle fibers begin to form from the centrosomes. These fibers are essential for attaching to chromosomes and pulling them apart during later stages of mitosis.
4. Step 4: Compare Prophase to the other phases. For example, in Metaphase, chromosomes align at the cell's equatorial plane, while in Anaphase, sister chromatids are pulled apart. Telophase involves the reformation of the nuclear envelope and decondensation of chromosomes.
5. Step 5: Conclude that Prophase is the phase characterized by both the condensation of chromosomes and the formation of spindle fibers, distinguishing it from the other phases of mitosis.