Neco Model Questions Vol1 2022 Biology Question 2

Practice essay / theory question 2 from the 2022 Neco Model Questions Vol1 Biology examination. This question covers cell division, mitosis, cell cycle regulation .

Neco Model Questions Vol1 2022 Biology Essay / Theory
Topics: cell division mitosis cell cycle regulation
Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay
Neco Model Questions Vol1 2022 Biology Question 2 diagram

The labelled diagram shows an animal cell at successive stages of the cell cycle: Interphase (sub‑divided into G1, S and G2), Prophase, Metaphase, Anaphase, Telophase and Cytokinesis.

Question Parts

( a )
Describe the principal events that occur in each of the six stages shown in the diagram.
( b )
Explain why the spindle‑assembly checkpoint operating in metaphase is essential for the fidelity of cell division.
( c )
The total duration of the cell cycle for this cell type is 20 h. The proportion of time spent in G1, S, G2 and M phases are 40 %, 30 %, 20 % and 10 % respectively. (i) Calculate the duration (in hours) of each phase. (ii) A mutation lengthens the G2 phase by 50 % while the other phases remain unchanged. Determine the new total cell‑cycle time and discuss one possible cellular consequence of this lengthened G2 period.
( ) Calculate the duration (in hours) of each phase.
( ) Determine the new total cell‑cycle time and discuss one possible cellular consequence of this lengthened G2 period.

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About This Question

This is Neco Model Questions Vol1 2022 Biology Question 2. It is one of the essay questions from the 2022 Neco Model Questions Vol1 Biology examination.

The question covers cell division, mitosis, cell cycle regulation .

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