Spindle fibres attach on to
1. Kinetochore of the chromosome
2. centromere of the chromosome
3. Kinetosome of the chromosome
4. telomere of the chormosome
In meiosis crossing over is initiated at
1. leptotene
2. Zygotene
3. diplotene
4. pachytene
Arrange the following events of meiosis in correct sequences
I. Crossing Over
II. Synapsis
III. terminalisation of chaismata
IV. Disapperance of nucleolus
(1) II, I, IV, III
(2) II, I, III, IV
(3) I, II, III, IV
(4) II, III, IV, I
During which phase(s) of cell cycle, the amount of DNA in a cell remain at 4C level if the
initial amount is denoted as 2C?
1. G0 and G1
2. G1 and S
3. Only G2
4. G2 and M
The complex formed by a pair of synapsed homologous chromosomes is called
1. equatorial plate
2. Kinetochore
3. bivalent
4. axoneme
A stage in cell division is shown in the figure. Select the answer which gives correct
identification of the stage with its characteristics.
1. Telophase - Nuclear envelope reforms, Golgi complex reforms
2. Late anaphase - Chromosomes move away from equatorial plate, Golgi complex not
present
3. Cytokinesis - Cell plate formed, mitochondria distributed between two daughter cells
4. Telophase - Endoplasmic reticulum and nucleolus not reformed yet
During gamete formation, the enzyme recombinase participates during
1. Metaphase-I
2. Anaphase-II
3. Prophase-I
4. Prophase-II
Select the correct option with respect to mitosis.
1. Chromatids start moving towards opposite poles in telophase
2. Golgi complex and endoplasmic reticulum are still visible at the end of prophase
3. Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
4. Chromatids separate but remains in the centre of the cell in anaphase
Given below is a schematic break-up of the phases/stages of the cell cycle
Which one of the following is the correct indication of the stage/phase in the cell cycle?
1. B-Metaphase
2. C-Karyokinesis
3. D-Synthesis phase
4. A-Cytokinesis
Astral rays arise from
1. centriole
2. cytoplasm
3. chromatid
4. centromere.