Pro-metaphase Stage in Meiosis in Plants
Prometaphase is the second phase of mitosis, the procedure that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells.
The changes of this phase are as follows:
(i) Same protein enriched fibrous spindle apparatus occurs.
(ii) Spindle apparatus consists of two kinds of fibres such as
- Spindle fibre- These fibres extend from one pole to another
- Traction fibre- These fibres extend from one pole to the centromere of chromosome
(iii) When the formation of spindle apparatus being completed, the chromosomes start coming to the equatorial plant.
(iv) At the end of this phase, nucleolus completely disappears.
(v) The chromosomes finish condensing, so they are very compact.
(vi) The nuclear envelope breaks down, releasing the chromosomes.
During prometaphase, the physical barrier that encloses the nucleus, called the nuclear envelope, breaks down. The breakdown of the nuclear envelope frees the sister chromatids from the nucleus, which is essential for separating the nuclear substance into two cells.