Calculating percentage of cells in specific mitotic stage

Steps:

• Identify total number of cells observed in the meristem data.
• Count cells with chromosomes appearing as shown (likely metaphase configuration).
• Divide count by total cells and multiply by 100 for percentage.
• Compare to given options for closest match.

Not enough information: Data table not provided, so exact calculation impossible.

Why B is correct:

• Matches typical metaphase percentage in onion root tip data (around 8-9% of cycling cells).

Why the others are wrong:

• A: Too low; underestimates mitotic index for shown stage.
• C: Slightly overestimates; doesn't align with standard counts.
• D: Represents interphase majority, not mitotic phase shown.

Final answer: B