During which phase of mitosis do chromosomes condense and the nucleus breaks down?

During which phase of mitosis do chromosomes condense and the nucleus breaks down?

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

Answer: (C)

During prophase, the initial stage of mitosis, several crucial events occur that set the stage for cell division. One of the most significant events during this phase is the condensation of chromosomes. This condensation makes the chromosomes much more visible under a microscope as they become shorter and thicker, transitioning from their more relaxed state of chromatin. In addition to chromosome condensation, prophase is characterized by the breakdown of the nuclear envelope, which separates the contents of the nucleus from the cytoplasm. This breakdown is essential for allowing spindle fibers to access the chromosomes, which will later facilitate their alignment and separation. The disassembly of the nucleus ensures that the chromosomal material can be properly segregated into the daughter cells. These two events—chromosome condensation and nuclear envelope breakdown—are critical for the successful progression of mitosis, ultimately leading to the equal distribution of genetic material to the daughter cells.

During prophase, the initial stage of mitosis, several crucial events occur that set the stage for cell division. One of the most significant events during this phase is the condensation of chromosomes. This condensation makes the chromosomes much more visible under a microscope as they become shorter and thicker, transitioning from their more relaxed state of chromatin.

In addition to chromosome condensation, prophase is characterized by the breakdown of the nuclear envelope, which separates the contents of the nucleus from the cytoplasm. This breakdown is essential for allowing spindle fibers to access the chromosomes, which will later facilitate their alignment and separation. The disassembly of the nucleus ensures that the chromosomal material can be properly segregated into the daughter cells.

These two events—chromosome condensation and nuclear envelope breakdown—are critical for the successful progression of mitosis, ultimately leading to the equal distribution of genetic material to the daughter cells.