Ijmb Model Questions Vol1 2020 Biology Question 2

Practice essay / theory question 2 from the 2020 Ijmb Model Questions Vol1 Biology examination. This question covers cell division, mitosis .

Ijmb Model Questions Vol1 2020 Biology Essay / Theory
Topics: cell division mitosis
Question 2 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

The illustration shows an animal cell at successive stages of mitosis. The four stages are labelled I, II, III and IV. Six cellular structures are labelled as follows: A – condensed chromosome, B – spindle fibre, C – centriole pair, D – nuclear envelope, E – separated sister chromatids, F – cytokinetic furrow.

Question Parts

( a )
Identify the stage represented by each of I, II, III and IV (e.g., prophase, metaphase, anaphase, telophase).
( b )
For each stage (I–IV) describe two key events that occur, making reference to the labelled structures (A–F).
( c )
If a complete mitotic division in this cell type takes 60 minutes and the relative durations are: prophase 30 %, metaphase 20 %, anaphase 15 % and telophase 35 %, calculate the time (in minutes) spent in each stage.
( d )
Briefly compare mitosis with meiosis I in terms of (i) chromosome number in the daughter cells and (ii) the generation of genetic variation.
( e )
Answer the following about the structures shown:
( ) Explain why the presence of centrioles (C) is essential for spindle formation.
( ) Discuss the possible cellular consequence if spindle fibres (B) fail to attach correctly to chromosomes.

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About This Question

This is Ijmb Model Questions Vol1 2020 Biology Question 2. It is one of the essay questions from the 2020 Ijmb Model Questions Vol1 Biology examination.

The question covers cell division, mitosis .

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