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Multiple Choice
In what phase of mitosis do chromosomes first become visible?
A
Prophase
B
Metaphase
C
Anaphase
D
Telophase
Verified step by step guidance
1
Understand the process of mitosis, which is the division of a single cell into two genetically identical daughter cells. Mitosis consists of several phases: prophase, metaphase, anaphase, and telophase.
Recognize that during prophase, the chromatin condenses into visible chromosomes. This is the first phase where chromosomes become visible under a microscope.
In prophase, the nuclear envelope begins to break down, and the mitotic spindle starts to form. This is crucial for the later separation of chromosomes.
Compare prophase with other phases: In metaphase, chromosomes align at the cell's equatorial plane; in anaphase, sister chromatids are pulled apart; and in telophase, the nuclear envelope reforms around separated chromatids.
Conclude that the visibility of chromosomes is a key characteristic of prophase, distinguishing it from the other phases of mitosis.