Which of the following is the correct sequence of events of interphase:-
a. | cells metabolically active |
b. | Duplication of the chromosome but chromosome number remains constant |
c. | M phased |
d. | Synthesis of protein [Tubulin] |
1.
2.
3.
4.
Which of the following is characteristic of prophase I of meiosis I:-
1. | Synapsis in zygotene, genetically different chromatid are seen in pachytene |
2. | Exchange of genes in leptotene, genetically similar chromatids are seen in zygotene. |
3. | Chiasmata are present in metaphase |
4. | Splitting of centromere in anaphase-I |
Select correct match (column I with column ll)
Column l | Column II | ||
a. | Bivalent as terad | (i) | Diplotene |
b. | Chromatids separation | (ii) | Telophase l |
c. | Terminalisation start phase | (iii) | Anaphase ll |
d. | Nuclear membrane and nucleolus reappear | (iv) | Pachytene |
1. a(iv), b(iii), c(i), d(ii)
2. a(iv), b(iii), c(ii), d(i)
3. a(iii), b(iv), c(i), d(ii)
4. a(ii), b(iii), c(i), d(iv)
Mark the correct statement:
1. | The stage between two successive meiotic division is generally long lived |
2. | In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls |
3. | Meiosis results in conservation of specific chromosomes number of each species across generations in asexually reproducing organisms |
4. | Telophase - I can last for months or year |
Choose the odd one with respect to significance of meiosis
1. | Conservation of specific chromosome number of each species |
2. | Increases genetic variability |
3. | Able to regenerate part or whole of the organism |
4. | Introduces new combination of traits |
Which stage of meiosis - I is characterized by the
appearance of recombination nodules?
1. Diplotene
2. Zygotene
3. Diakinesis
4. Pachytene
Which is the characteristic feature of metaphase?
1. | Spindle fibres attach to kinetochores of chromosomes. |
2. | Initiation of condensation of chromosomal material. |
3. | Chromosomes cluster at opposite spindle poles. |
4. | Disappearance of Golgi complexes, endoplasmic reticulum, nucleolus, and the nuclear envelope. |
During mitosis, endoplasmic reticulum and nucleolus begin to disappear at:
1. | Late metaphase | 2. | Early prophase |
3. | Late prophase | 4. | Early metaphase |
Crossing over takes place between which chromatids and in which stage of the cell cycle?
1. | Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I. |
2. | Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I. |
3. | Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I. |
4. | Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I. |
Alignment of bivalent chromosomes on the equatorial
plate and splitting of centromeres occur respectively
in which of the following stages of cell division?
1. | Anaphase I and anaphase II. |
2. | Metaphase II and anaphase I. |
3. | Metaphase I and anaphase II. |
4. | Pachytene and telophase I. |