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)

Identify the correct statement with regard to G 1 phase (Gap 1) of interphase.

Cell is metabolically active, grows but does not replicate its DNA.

Reorganisation of all cell components takes place.

DNA synthesis or replication takes place.

EASY

Earn 100

Interkinesis is the longest period of meiosis.

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Important Questions on Genetics and Evolution (AHL)

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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?

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

Which ONE of the following statements about mitosis is CORRECT?

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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?

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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.

HARD

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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:

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

Identify the correct statement with regard to G₁ phase (Gap 1) of interphase.

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

Identify the event in meiosis mediated by the enzyme recombinase.

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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:

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

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?

MEDIUM

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

EASY

Biology>Genetics and Evolution>Genetics and Evolution (AHL)>Meiosis (AHL)

A bacterial culture was started with an inoculum of

10

cells. What will be the number of cells at the end of

10

cycles of division, assuming that every progeny cell undergoes division in each cycle?

Interkinesis is the longest period of meiosis.

Important Questions on Genetics and Evolution (AHL)

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