Select the correct option: I II ( a ) Synapsis aligns homologous chromosomes ( i ) Anaphase – II ( b ) Synthesis of RNA and protein ( i i ) Zygotene ( c ) Action of enzyme recombinase ( i i i ) G 2 – phase ( d ) Centromeres do not separate but chromatids move towards opposite poles ( i v ) Anaphase – I ( v ) Pachytene

( a ) ( i i ) ( b ) ( i i i ) ( c ) ( v ) ( d ) ( i v )

( a ) ( i i ) ( b ) ( i ) ( c ) ( i i i ) ( d ) ( i v )

( a ) ( i ) ( b ) ( i i ) ( c ) ( v ) ( d ) ( i v )

( a ) ( i i ) ( b ) ( i i i ) ( c ) ( i v ) ( d ) ( v )

Match the following with respect to meiosis (a) Zygotene (i) Terminalization (b) Pachytene (ii) Chiasmata (c) Diplotene (iii) Crossing over (d) Diakinesis (iv) Synapsis Select the correct option from the following

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

MEDIUM

Earn 100

Write the characteristic features of diakinesis.

Important Questions on Cell Cycle

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Select the correct option:

	I		II
( $a$ )	Synapsis aligns homologous chromosomes	( $i$ )	Anaphase – II
( $b$ )	Synthesis of RNA and protein	( $i i$ )	Zygotene
( $c$ )	Action of enzyme recombinase	( $i i i$ )	$G_{2}$ – phase
( $d$ )	Centromeres do not separate but chromatids move towards opposite poles	( $i v$ )	Anaphase – I
		( $v$ )	Pachytene

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

The stage during which separation of the paired homologous chromosomes begins is

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

After meiosis-II, daughter cells differ from the parent cells and each other in their genotypes. This can occur because of which one of the following mechanism (s)?

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Number of bivalents, chromatid tetrads, DNA strands, telomers present in pachytene phase of meiocyte of Maize

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Match the stages of meiosis of Column-I to their characteristic features in Column-II and select the correct option using the codes given below:

Column-I		Column–II
a.	Pachytene	(i)	The pairing of homologous chromosomes
b.	Metaphase I	(ii)	Terminalization of chiasmata
c.	Diakinesis	(iii)	Crossing-over takes place
d.	Zygotene	(iv)	Chromosomes align at the equatorial plate

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

A cell at the telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of the cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:

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Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Which of the following options gives the correct sequence of events during mitosis?

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Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Choose the correct statements among the following.
(A) The stage between two meiotic divisions is called interphase
(B) During zygotene, the pairing of homologous chromosomes and synapsis takes place.
(C) Initiation of mitotic spindle takes place during metaphase
(D) In animals, mitotic cell division takes place in diploid somatic cells and not in haploid cells

HARD

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Explain the mechanism of crossing over.

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Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Which of the following best describes the DNA content and the number of chromosomes at the end of S and M phases of the cell cycle in mitosis, if the DNA content of the cell at the beginning of the cell cycle (G1 phase) is considered as C and the number of chromosomes 2 N?

EASY

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Identify the event in meiosis mediated by the enzyme recombinase.

EASY

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

A single bacterium is actively growing in a medium that supports its growth to a number of 100 million. Assuming the division time of the bacterium as 3 hours and the life span of non-dividing bacteria as 5 hours, which ONE of the following represents the maximum number of bacteria that would be present at the end of 15 hour?

HARD

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has:

EASY

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Which ONE of the following statements about mitosis is CORRECT?

EASY

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Following the cell cycle scheme given below, what is the probability that a cell would be in M-phase at any given time?

Question Image

EASY

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

HARD

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Define crossing over. Explain crossing over with a diagram.

MEDIUM

Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Arrange the following statements on meiosis in a correct sequence.
A) Terminalisation of chiasmata.
B) Dissolution of synaptonemal complex.
C) Homologous chromosome separation.
D) Appearance of recombination nodules.
E) Pairing of homologous chromosomes.
F) Disappearance of nuclear envelope.

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Biology>Cell Biology and Biomolecules>Cell Cycle>Cell Division

Match the following with respect to meiosis

(a)	Zygotene	(i)	Terminalization
(b)	Pachytene	(ii)	Chiasmata
(c)	Diplotene	(iii)	Crossing over
(d)	Diakinesis	(iv)	Synapsis

Select the correct option from the following

Write the characteristic features of diakinesis.

Important Questions on Cell Cycle

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