Why are whitefish embryos commonly used to study mitosis in introductory cell-biology labs?

• A. Their cells lack a nucleus, so spindle formation can be watched directly in the cytoplasm without nuclear breakdown.
• B. They are prokaryotic cells that undergo binary fission, making chromosome segregation simpler to observe.
• C. Their embryonic cells divide rapidly and have large, easily visible chromosomes that can be observed in many mitotic stages on prepared slides.
• D. They have extremely long cell cycles with few dividing cells, allowing prolonged observation of a single mitotic event.

Answer: (C)