Which phase involves chromatin condensing into visible chromosomes and the dissolution of the nucleus?

Which phase involves chromatin condensing into visible chromosomes and the dissolution of the nucleus?

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

Answer: (A)

The main idea here is what happens at the start of mitosis when the cell prepares to separate its genetic material. During prophase, chromatin fibers condense into visible chromosomes, making them easier to move without tangling. At the same time, the nuclear envelope breaks down and the nucleus dissolves, which allows spindle fibers to interact with chromosomes. This condensation and nuclear dissolution are what set the stage for accurate chromosome segregation. In the next phase, chromosomes align in the center of the cell, but the nucleus is no longer dissolving; that step has already occurred. Later, the sister chromatids are pulled apart toward opposite poles, and in the final phase, the nuclear envelope re-forms around the separated chromosomes and chromatin de-condenses.

The main idea here is what happens at the start of mitosis when the cell prepares to separate its genetic material. During prophase, chromatin fibers condense into visible chromosomes, making them easier to move without tangling. At the same time, the nuclear envelope breaks down and the nucleus dissolves, which allows spindle fibers to interact with chromosomes. This condensation and nuclear dissolution are what set the stage for accurate chromosome segregation.

In the next phase, chromosomes align in the center of the cell, but the nucleus is no longer dissolving; that step has already occurred. Later, the sister chromatids are pulled apart toward opposite poles, and in the final phase, the nuclear envelope re-forms around the separated chromosomes and chromatin de-condenses.