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 )

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Why meiosis occurs during gamete formation?

Important Questions on Cell Division

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Biology>Cell Structure and Function>Cell Division>Meiosis

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 Structure and Function>Cell Division>Meiosis

If the mature egg cell of a diploid organism has

6

chromosomes, then the total number of chromatids in the Anaphase

I

of meiosis would be

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Biology>Cell Structure and Function>Cell Division>Meiosis

Regarding meiosis, which of the statements is incorrect?

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

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?

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Biology>Cell Structure and Function>Cell Division>Meiosis

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

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Biology>Cell Structure and Function>Cell Division>Meiosis

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 Structure and Function>Cell Division>Meiosis

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

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 Structure and Function>Cell Division>Meiosis

Assertion $(A) :$ In crossing over, the exchange of genetic material between two homologous chromosomes occur during both mitotic and meiotic cell divisions.

Reason $(R) :$ The process of crossing over is only possible and is mediated by recombinase.

The correct answer is:

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

In prophase I of meiosis, synaptonemal complex is formed between

I)

Pair of homologous chromosomes

I I)

Tetrad of chromatids

I I I)

Bivalent chromosomes

I V)

Recombination modules of non sister chromatids

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

Which ONE of the following statements about mitosis is CORRECT?

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Biology>Cell Structure and Function>Cell Division>Meiosis

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

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Biology>Cell Structure and Function>Cell Division>Meiosis

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

HARD

Biology>Cell Structure and Function>Cell Division>Meiosis

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 Structure and Function>Cell Division>Meiosis

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?

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4 C level if the initial amount is denoted as 2C?

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Biology>Cell Structure and Function>Cell Division>Meiosis

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)?

EASY

Biology>Cell Structure and Function>Cell Division>Meiosis

The correct sequence of events in prophase I is:

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Biology>Cell Structure and Function>Cell Division>Meiosis

Match the changes which occur in the chromosomes during meiosis, with the different phases of prophase-I.

	List - I		List - II
(a)	Pachytene	(i)	Compaction of chromosomes
(b)	Zygotene	(ii)	Terminalisation of chiasmata
(c)	Diplotene	(iii)	Pairing of chromosomes
(d)	Leptotene	(iv)	Dissolution of synaptonemal complex
		(v)	Recombination nodule

The correct answer is

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Biology>Cell Structure and Function>Cell Division>Meiosis

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

Why meiosis occurs during gamete formation?

Important Questions on Cell Division

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