a. | Synapsis of homologous chromosomes |
b. | Chromosomes become gradually visible under a microscope |
c. | Crossing over between non-sister chromatids of homologous chromosomes |
d. | Terminalisation of chiasmata |
e. | Dissolution of synaptonemal complex |
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. |
1. Pachytene of Prophase I | 2. Diplotene of Prophase I |
3. Metaphase II | 4. Anaphase II |
A: | Prophase I and arrow shows chiasmata |
B: | Anaphase I and arrow shows sister chromatids associated at centromere |
C: | Prophase II and arrows show attachment of spindle microtubules to kinetochore |
D: | Anaphase II and the diagram shows separated sister chromatids after the split of centromere |
1. | Only A, B and C | 2. | Only A, C and D |
3. | Only B, C and D | 4. | A, B, C and D |