Select the correct option based on statements below:
Assertion (A): Meiosis leads to recombinations of genes.
Reason (R): Crossing over occurs in pachytene sub-stage of prophase I of meiosis.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Cell Cycle: Meiosis I |
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A: Tendency of parental combinations to remain together is called crossing over.
R: Crossing over provides proof in favour of the linear arrangement of genes on chromosomes.
In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion..
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3. If Assertion is a true statement but Reason is false..
4. If both Assertion and Reason are false statements.
Subtopic:  Cell Cycle: Meiosis I |
 53%
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Match each item in Column I with one item in Column II and chose your answer from the codes given below.

Column I

(stage of prophase I)

Column II

(event)

I. Zygotene

II. Pachytene

III. Diplotene

IV. Diakinesis

1. Crossing over

2. Chiasmata formation

3. Bivalent formation

4. Terminalization of chiasmata

Codes:

                I            II            III            IV

1.             1            2             3               4

2.             2            1             4               3

3.             3            1             2               4

4.             3            2             1               3

Subtopic:  Cell Cycle: Meiosis I |
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Match the following column I with column II. 

Column I  Column II
A. Synapsis aligns homologous chromosomes (i)  Anaphase II
B. Synthesis of RNA and protein (ii)  Zygotene
C. Action of enzyme recombinase (iii)  G2 - phase
D. Centromeres do not separate, but chromatids move towards opposite poles (iv)  Anaphase I
(v)  Pachytene

1. A-(ii), B-(i), C-(iii), D-(iv)

2. A-(ii), B-(iii), C-(v), D-(iv)

3. A-(i), B-(ii), C-(v), D-(iv)

4. A-(ii), B-(iii), C-(iv), D-(v)

Subtopic:  Intro to Cell Cycle & Interphase | Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
 85%
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Match List I with List II
List I List II
A. Pairing of homologous chromosomes I. Chiasmata
B. Actual interchange of segments between two homologous chromosomes II. Synaptonemal complex
C. Protein body formed between paired homologs III. Synapsis
D. The cross shaped configuration visible between homologs IV. Crossing over
Choose the correct answer from the options given below:
1.  A - (IV); B - (III); C- (I); D - (II)
2.  A - (III); B - (IV); C- (I); D - (II)
3.  A - (III); B - (IV); C- (II); D - (I)
4.  A - (IV); B - (III); C- (II); D - (I)
Subtopic:  Cell Cycle: Meiosis I |
 78%
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Read the four statements (a-d) and choose the correct option.

a. Spindle fibers attach to kinetochores of chromosomes during metaphase.
b. Cell growth results in disturbing the ratio between the nucleus and the cytoplasm.
c. Pachytene stage is relatively short-lived compared to the leptotene.
d. Interkinesis is a short-lived stage characterized by duplication of DNA.

1  a, b & c are correct

2  Only c is incorrect

3  b & d are correct 

4  a & b are correct

Subtopic:  Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
 64%
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Given below are two statements:
Statement I: In mitosis, chromosomal number in the progeny as well as in parents remains the same
Statement II: Mitosis takes place in gametes

In light of the above statements, choose the most appropriate answer from the options given below:
1. Both statement I and statement II are correct
2. Both statement I and statement II are incorrect
3. Statement I is correct but statement II is incorrect 
4. Statement I is incorrect but statement II is correct 
Subtopic:  Intro to Cell Cycle & Interphase | Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis I |
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Assertion(A): Meiosis reduces the chromosome number by half in gametes.
Reason(R): Meiosis is called the reductional division.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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