Neco Model Questions Vol1 2018 Biology Question 2

Practice practical question 2 from the 2018 Neco Model Questions Vol1 Biology examination. This question covers Cell Division .

Neco Model Questions Vol1 2018 Biology Practical

Topic: Cell Division

Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

A student prepares fresh root‑tip squashes of Allium cepa (onion). In an untreated sample 500 cells are examined and the following numbers of cells are recorded in each mitotic phase: prophase 120, metaphase 80, anaphase 50, telophase 30 (the remaining cells are in interphase). A second set of root tips is treated with 0.01 % colchicine solution for 4 h before fixation; 400 cells are examined and the distribution is: prophase 60, metaphase 150, anaphase 80, telophase 40, interphase 70.

Question Parts

( a )

Calculate the mitotic index (MI = (number of cells in mitosis ÷ total cells) × 100) for the untreated and colchicine‑treated samples.

( b )

Determine the percentage of cells in each mitotic phase (prophase, metaphase, anaphase, telophase, interphase) for both samples.

( c )

Explain the effect of colchicine on the cell cycle, using the results obtained.

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About This Question

This is Neco Model Questions Vol1 2018 Biology Question 2. It is one of the practical questions from the 2018 Neco Model Questions Vol1 Biology examination.

The question covers Cell Division .

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