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Byju's Answer
Standard XII
Biology
Prophase II
Which of the ...
Question

Which of the stages of the cell cycle involves contraction of spindle fibres?

A
Metaphase I
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B
Anaphase II
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C
Prophase II
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D
Telophase II
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Solution

The correct option is C Anaphase II
During anaphase II, centromere of each chromosome divides into two. This separates the two chromatids of a chromosome into two independent daughter chromosomes. Each daughter chromosome is attached to spindle pole of its side by a spindle fiber, which contracts, thus, pulling the chromosome towards the spindle poles.
So, the correct answer is 'Anaphase II'

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Q. In which stage of the cell cycle the chromosomes are maximally condensed
(1)prophase
(2)metaphase
(3)anaphase
(4)telophase
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In which one of the following options the stages of mitosis have been given in correct sequence ?
(a) Prophase, metaphase, telophase, anaphase
(b) Prophase, metaphase, anaphase, telophase
(c) Anaphase, telophase, prophase, metaphase
(d) Telophase, anaphase, prophase, metaphase

Q. A biologist examines a series of cells and counts 160 cells in interphase, 20 cells in prophase, 6 cells in prometaphase, 2 cells in metaphase, 7 cells in anaphase, and 5 cells in telophase. If the complete cell cycle requires 24 hours, what is the average duration of M phase in these cells ?
Stage Number of cells Proportion of cells Average duration
counted at each stage (hours)
Interphase 1600.809.2
Prophase 200.102.4
Prometaphase 60.030.72
Metaphase 20.010.24
Anaphase 70.0350.84
Telophase 50.0250.6
Totals 2001.024

Q. The following diagram represents stages in the second meiotic division. [5 MARKS]



(i) Label each phase correctly as Prophase II, Metaphase II, Anaphase II or Telophase II.
(ii) Arrange the stages in the correct sequence of development.
(iii) Make a series of sketches to show the phases of cell division in the meiotic division.
Q. Pick the correct statements.
A. Synapsis of homologous chromosomes takes place during prophase I of meiosis.
B. Division of centromeres takes place during anaphase I of meiosis.
C. Spindle fibres disappear completely in telophase of mitosis.
D. Nucleoli reappear at telophase I of meiosis.
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