Neco Model Questions Vol1 2024 Biology Question 2

Practice practical question 2 from the 2024 Neco Model Questions Vol1 Biology examination. This question covers Cell Division, Mitosis, Microscopy, Data Analysis .

Neco Model Questions Vol1 2024 Biology Practical
Topics: Cell Division Mitosis Microscopy Data Analysis
Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • practical

You are investigating mitosis in onion (Allium cepa) root tip cells using the squash technique. Five fields were examined and the numbers of cells observed in each stage of the cell cycle are recorded in the table below. | Field | Prophase | Metaphase | Anaphase | Telophase | Interphase | |-------|----------|-----------|----------|-----------|------------| | 1 | 12 | 8 | 4 | 2 | 24 | | 2 | 10 | 9 | 5 | 1 | 25 | | 3 | 11 | 7 | 6 | 2 | 24 | | 4 | 13 | 8 | 3 | 3 | 23 | | 5 | 9 | 10 | 5 | 2 | 24 |

Question Parts

( a )
Calculate the total number of cells observed and the total number of cells in mitosis (i.e., sum of prophase, metaphase, anaphase and telophase) across all five fields.
( b )
Determine the mitotic index (MI) as a percentage using the formula MI = (Number of cells in mitosis / Total number of cells) × 100. Show your working and give the answer to one decimal place.
( c )
Identify which phase of mitosis is most frequent in the sample and discuss what this may indicate about the rate of cell division in the onion root tip.

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About This Question

This is Neco Model Questions Vol1 2024 Biology Question 2. It is one of the practical questions from the 2024 Neco Model Questions Vol1 Biology examination.

The question covers Cell Division, Mitosis, Microscopy, Data Analysis .

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