Q. No.During which stage of mitosis do the following events occur?
I:
Centromeres split and chromatids separate
II:
Chromatids move to opposite poles
1.
Prophase
2.
Metaphase
3.
Anaphase
4.
Telophase
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 |
All the following are significances of mitosis except:
| 1. | Restoration of nuclear/cytoplasmic ratio |
| 2. | Growth of living organisms |
| 3. | Replacement of lost cells |
| 4. | Generation of genetic variation |
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 |
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. |
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 |
Males produce gametes by mitosis in:
| 1. | Honey bees | 2. | Grasshopper |
| 3. | Birds | 4. | Drosophila melanogaster |
1. Bivalent
2. Tetrad
3. Mitotic apparatus
4. Sister chromosomes
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 |
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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