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 |
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 |
Assertion (A): | Meiosis conserves specific chromosome number of each species across generations in sexually reproducing organisms. |
Reason (R): | Meiosis, per se, results in reduction of chromosome number by half. |
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. |
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 |
1. | the cell plate that represents the middle lamella |
2. | the cell plate that represents the primary cell wall |
3. | the cleavage furrow that represents the middle lamella |
4. | the contractile ring that represents the primary cell wall |
1. | The chromosome number and DNA content remain 2N and 2C respectively |
2. | The chromosome number and DNA content are 4N and 2C respectively |
3. | The chromosome number and DNA content are 2N and 4C respectively |
4. | The chromosome number and DNA content are 4N and 4C respectively |
COLUMN I | COLUMN II | ||
A. | Zygotene | P. | Crossing over |
B. | Pachytene | Q. | Synapsis |
C. | Diplotene | R. | Terminalization of chiasmata |
D. | Diakinesis | S. | Appearance of chiasmata |
A | B | C | D | |
1. | Q | P | S | R |
2. | P | Q | S | R |
3. | P | Q | R | S |
4. | Q | P | R | S |
1. | Complete disintegration of nuclear envelope takes place. |
2. | Chromosomes are highly condensed. |
3. | Metaphase chromosomes are made up of four sister chromatids held together by centromere. |
4. | Chromosomes lie at the equator of the cell. |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Spindle fibres attach on to
1. kinetochore of the chromosome
2. centromere of the chromosome
3. kinetosome of the chromosome
4. telomere of the chromosome
The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of mitosis, if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after the S phase?
1. | 4 | 2. | 32 |
3. | 8 | 4. | 16 |