Q. No.Identify the correct statement amongst the following:
| 1. | Crossing over occurs in prophase I of meiosis and metaphase of mitosis. |
| 2. | DNA replication occurs once prior to mitosis and twice prior to meiosis. |
| 3. | Both mitosis and meiosis result in daughter cells identical to the parent cells. |
| 4. | Karyokinesis occurs once in mitosis and twice in meiosis. |
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In meiosis:
1. A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced twice
2. A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced twice and DNA content getting reduced once
3. A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced once and DNA content getting reduced twice
4. A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced once
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Meiosis results in the formation of:
1. Two genetically identical diploid cells
2. Two genetically non identical diploid cells
3. Four genetically identical haploid cells
4. Four genetically non identical haploid cells
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Synapsis occurs between
1. mRNA and ribosomes
2. Spindle fibers and centromere
3. Two homologous chromosomes
4. A male and a female gamete
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The enzyme recombinase is required at which stage of meiosis ?
| 1. | Pachytene | 2. | Zygotene |
| 3. | Diplotene | 4. | Diakinesis |
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Match each item in Column I with one in Column II and select the correct answer from the codes given below:
|
Column I |
|
Column II |
|
|
A |
Zygotene |
a |
Pairing of homologous chromosomes |
|
B |
Pachytene |
b |
Appearance of chiasma |
|
C |
Diplotene |
c |
Terminalization of chiasma |
|
D |
Diakinesis |
d |
Crossing over |
Codes
| A | B | C | D | |
| 1. | a | c | b | d |
| 2. | a | d | b | c |
| 3. | a | b | c | d |
| 4. | b | c | d | a |
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The correct chronology of stages of Prophase I is:
1. Leptotene – Zygotene – Pachytene – Diplotene – Diakinesis
2. Leptotene – Pachytene – Zygotene – Diplotene – Diakinesis
3. Leptotene – Zygotene – Pachytene – Diakinesis – Diplotene
4. Zygotene – Leptotene – Pachytene – Diakinesis – Diplotene
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Which of the following stages of Prophase I of meiosis I can last for many months or years in certain vertebrate oocytes?
| 1. | Zygotene | 2. | Pachytene |
| 3. | Diplotene | 4. | Diakinesis |
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The paired homologues seen during zygotene of meiosis I are known as:
| 1. | Bivalent | 2. | Tetrad |
| 3. | Mitotic apparatus | 4. | Sister chromosomes |
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Which of the following is not a feature of diakinesis stage of prophase I of meiosis I?
1. Terminalization of chiasmata
2. Meiotic spindle assembling to prepare separation of homologues
3. Decondensation of the chromatin
4. NEBD and disappearance of nucleolus
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