Q. No.Microtubules from opposite poles of the spindle attach to the pairs of homologous chromosomes during
1.
Pachytene
2.
Metaphase – I
3.
Metaphase – II
4.
Early prophase
| 1. | Pachytene |
| 2. | Metaphase – I |
| 3. | Metaphase – II |
| 4. | Early prophase |
Exchange of genetic material between two homologous chromosomes occurs in
(1) Leptotene
(2) Diakinesis
(3) Pachytene
(4) Diplotene
A typical eukaryotic cell cycle is illustrated by human cells in culture. These cells divide once in approximately every
1. 24 hours
2. 90 minutes
3. 20 minutes
4. 9 hours
Choose incorrect statement with respect to cell cycle
| 1. | Duration of cell cycle can vary from organism to organism |
| 2. | Duration of cell cycle is uniform in different cell types of an organism |
| 3. | Events of cell cycle are under genetic control |
| 4. | It is divided into two basic phases |
Choose the correct sequence with respect to different phases of cell cycle
| 1. | G1 S, G2, M |
| 2. | G1, G2, S, M |
| 3. | M, G2, G1, S |
| 4. | S, M, G2, G1 |
Human nerve cells do not divide after birth and they remain throughout their life in which phase of cell cycle?
| 1. | M-phase |
| 2. | G1 phase |
| 3. | G0 phase |
| 4. | Invisible phase |
Various phases of cell cycle are controlled by
| 1. | Cyclin proteins |
| 2. | Cyclin dependent protein kinases |
| 3. | Phosphorylation of cyclin dependent protein kinases |
| 4. | More than one option is correct |
Amount of DNA and Number of chromosomes in G2 phase of cell cycle would be
| 1. | Double and equal to that of in G1 phase respectively |
| 2. | Half and equal to that of in G1 phase respectively |
| 3. | Equal and half to that of in G1 phase respectively |
| 4. | Double and double to that of in G1 phase respectively |
Exchange of genetic material between non-sister chromatids of homologous chromosomes in pachytene stage is facilitated by
(1) Dynein
(2) Recombinase
(3) chiasmata
(4) Calmodulin
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