- 1(current)
Q. No.Humans have a haploid chromosome number n = 23. How many tetrads will be formed during meiosis?
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
Arrange the following events of meiosis in correct sequence
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
| 1. | (b), (c), (d), (a) | 2. | (b), (a), (d), (c) |
| 3. | (b), (a), (c), (d) | 4. | (a), (b), (c), (d) |
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Centromeres split leading to the separation of sister chromatids and the pulling of the separated sister chromatids to the opposite poles is seen in:
| I: | Mitotic anaphase |
| II: | Anaphase I |
| III: | Anaphase II |
| 1. | Only I |
| 2. | Only I and II |
| 3. | Only III |
| 4. | Only I and III |
The phase of mitosis in which the spindle fibers break apart, two new nuclear membranes begin to form, and the chromosomes disperse into chromatin is
| 1. | metaphase | 2. | telophase |
| 3. | anaphase | 4. | prophase |
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Consider the given two statements:
| I: | Meiosis is responsible for maintaining the chromosome number across generations in sexually reproducing organisms. |
| II: | Meiosis results in reduction of chromosome number by half in the daughter cells. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
In fruit flies, which have 4 chromosome pairs, the number of possible arrangements of chromosomes in resultant haploid cells at the end of meiosis II is:
| 1. | 2 | 2. | 8 |
| 3. | 16 | 4. | 64 |
Microtubules from opposite poles of the spindle get attached to the kinetochores of sister chromatids in:
| 1. | Metaphase I | 2. | Anaphase I |
| 3. | Metaphase II | 4. | Anaphase II |
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| 1. | Metaphase I | Bivalent align on the equatorial plate |
| 2. | Anaphase I | Splitting of centromere |
| 3. | Prophase II | Nuclear membrane disappears by the end |
| 4. | Metaphase II | Microtubules from the opposite poles of the spindle get attached to the kinetochores of sister chromatids |
The human meiocyte shows 92 chromatids at the end of S phase. The number of centromeres in this cell will be:
| 1. | 23 | 2. | 46 |
| 3. | 69 | 4. | 92 |
Match the stage of meiotic cell division in column I with corresponding event in Column II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A |
Metaphase I |
P |
Homologous chromosomes separate, sister chromatids remain associated |
|
B |
Anaphase I |
Q |
Centromere splits |
|
C |
Metaphase II |
R |
Bivalents align at the equatorial plate |
|
D |
Anaphase II |
S |
Microtubules from the opposite poles get attached to kinetochores of sister chromatids |
Codes:
|
A |
B |
C |
D |
|
|
1. |
P |
R |
S |
Q |
|
2. |
P |
R |
Q |
S |
|
3. |
R |
P |
Q |
S |
|
4. |
R |
P |
S |
Q |
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- 1(current)
Q. No.
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