Botany - Cell Cycle and Cell Division Question with Solution | TestHub
Correctly identify the stage of cell division shown in the given diagram.
Options:
Answer:
Solution:
Prophase - I
- It is subdivided into 5 phases :
Leptotene (Lepto = thin or delicate)
- Chromosomes gradually become visible.
- Condensation or compaction of the chromosomes continues.
Zygotene (Zygo = related to pairing or joining)
- Synapsis or pairing of chromosomes occur to bring the homologous chromosomes together.
- Synapsis is followed by the formation of synaptonemal complex (or bivalent or tetrad).
Pachytene (Pachy = thick)
- Bivalent chromosomes clearly appear as tetrad as condensation is in progress.
- In this stage crossing over occurs.
Diplotene (Diplo = double)
- Starting of diplotene is characterized by the dissolution of the synaptonemal complex and the
separation of the homologous chromosomes from each other except at the X shaped sites of cross
over. These X shapes sites are termed as Chiasmata.
Diakinesis (= Movement or separation of both)
- It is characterized by the terminalization of chiasmata.
