Which one of the following never occurs during mitotic cell division? 
1. Coiling and condensation chromatids 
2. Spindle fibres attach to Kinetochores of chromosomes 
3. Movement of centrioles towards opposite poles 
4. Pairing of homologous chromosomes
Subtopic:  Cell Division: Mitosis (Karyokinesis) |
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The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:
1. Terminalization
2. Synaptonemal complex
3. Bivalent
4. Sites at which crossing over occurs
Subtopic:  Cell Cycle: Meiosis I |
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Regarding Meiosis, which of the statement is incorrect ?
1. Four haploid cells are formed at the end of Meiosis-II
2. There are two stage in Meiosis, Meiosis-I and II
3. DNA replication occurs in S phase of Meiosis-II
4. Pairing of homologous chromosomes and recombination occurs in Meiosis-I
Subtopic:  Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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Select the incorrect statement with reference to mitosis:
1. Splitting of centromere occurs at anaphase.
2. All the chromosomes lie at the equator at metaphase.
3. Spindle fibres attach to centromere of chromosomes.
4. Chromosomes decondense at telosphase
Subtopic:  Cell Division: Mitosis (Karyokinesis) |
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In prophase I of Meiosis, chromosomes start pairing together and synapis takes place. This process occurs dusring which of the following stage? 
1. Pachytene 
2. Diplotene 
3. Leptotene 
4. Zygotene 

Subtopic:  Cell Cycle: Meiosis I |
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Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R) 
Assertion (A): The growth of multicellular organism is due to mitosis 
Reason (R) Mitosis is also called as equational division and it offers genetic stability 
In the light of the above statements choose the correct answer from the options given below: 
1. (A) is correct but (R is not correct 
2. (A) is not correct but R is correct 
3. Both (A) and (R) are correct and (R) is the correct explanation of (A) 
4. Both (A) and (R) are correct and (R) is not the correct explanation of (A) 

Subtopic:  Cell Division: Mitosis (Karyokinesis) | Cell Division: Mitosis (Cytokinesis) |
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Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). 
Assertion (A): The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and formation of X shaped structures called chiasmata 
Reason(R): In oocytes of some vertebrates, diplotene can last for months or years. In the light of the above statements, choose the correct answer from the options given below: 
1. (A) is correct but (R) is not correct 
2. (A) is not correct but (R) is correct 
3. Both (A) and (R) are correct and (R) is the correct explanation of (A) 
4. Both (A) and (R) are correct but (R) is not the the correct explanation of (A)

Subtopic:  Cell Cycle: Meiosis I |
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The oocytes of some vertebrates get arrested for years or months in: 
1. Telophase - I 
2. Diplotene 
3. Diakinesis 
4. Metaphase - I 

Subtopic:  Cell Cycle: Meiosis I |
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Select the correct sequence of events occurring during Prophase-I of Meiosis-I 
(a) Nuclear envelope breakdown 
(b) Synaptonemal complex formation 
(c) Compaction of chromosomes
(d) Terminalisation of chiasmata 
(e) Crossing over 
Choose the most appropriate answer from the options given below: 
1. (c) → (b)  → (e)  → (d)  → (a) 
2. (c) → (a)  → (b)  → (d)  → (e) 
3. (b) → (c)  → (a)  → (d)  → (e) 
4. (c) → (a)  → (b)  → (e)  → (d) 

Subtopic:  Cell Cycle: Meiosis I |
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Which stage of meiosis can last for months or years in the oocytes of some vertebrates?
1. Leptotene
2. Pachytene
3. Diplotene
4. Diakinesis
Subtopic:  Cell Cycle: Meiosis I |
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