Mitosis Stage Progression

Steps:

• Examine cell X in the photomicrograph to identify its current stage.
• Note that chromosomes are aligned at the cell's equator and attached to spindle fibers, indicating metaphase.
• Recognize that metaphase precedes anaphase in the mitotic sequence.
• Conclude that anaphase follows, with chromatids separating.

Why B is correct:

• Anaphase is defined as the stage where spindle fibers shorten, pulling sister chromatids to opposite poles for equal chromosome distribution.

Why the others are wrong:

• A describes prophase, where chromatin condenses and the nuclear envelope fragments—earlier than metaphase.
• C describes telophase, where spindles disassemble and nuclei reform—after anaphase.
• D describes metaphase itself, not the next step.

Final answer: B