A woman undergoing IVF retrieved 15 mature oocytes, 12 fertilized into zygotes. If each zygote divides into 2 cells every 24 hours, how many cells will be present after 72 hours? Assume no cell death.
Answer
96 cells
The correct answer is 96 cells — After 72 h: 48 × 2 = 96 cells.
Step-by-step solution
- Start with 12 zygotes.
- After 24 h: 12 × 2 = 24 cells.
- After 48 h: 24 × 2 = 48 cells.
- After 72 h: 48 × 2 = 96 cells.
Common mistake: Misapplying exponential formula or forgetting initial 12 cells
Concept tested: Cell division doubling time
Published · How this solution was prepared and checked
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