Write a Note on Meiosis
Note on Meiosis
Meiosis can be divided into two parts:
- i) Meiosis-I
- ii) Meiosis-II
It has following stages:
- i) It is very lengthy and important phase.
- ii) It is divided into 5 more sub-phases.
iii) Its important process in Synapsis in which homologous chromosomes begins to pair lengthwise.
- iv) Each pair consists of four chromatids.
- v) After Synapsis crossing over takes place. (in which chromosomes exchange their chromatids)
- i) The centromere of the homologous chromosomes arranges themselves on equator.
- i) In this phase homologous chromosomes begins to separate.
- ii) The spindle fiber contract.
iii) Half of the chromosomes move towards each pole.
- i) Half chromosomes reached towards their opposite poles.
- ii) Chromosomes again become elongated.
iii) Nuclear membrane and nucleoli are reformed.
- iv) Two daughter nuclei are formed.
This division is similar to mitosis. At the end of this stage four daughter cells are formed which afterwards change into spores (in plants) or gametes (in animals)
Note: Plus: The correspondence form of training will allow you not to lose a year, if it was not possible to enter the full-time department. In the end, a correspondence student always has a chance to transfer to a full-time form (of course, subject to the availability of free places in the group and the absence of academic debts). Less: The correspondence form of training does not give a respite from the army (girls, as always, are lucky). Plus: You can calmly build your career, continuing to work, accumulating practical experience. You do not have to divide your time into priorities, the correspondence form of training is an excellent opportunity for self-development. Less: You will have much less time to study than a full-time student – you still have to work. And to get the full knowledge is very important full of energy and time, especially in the first stages. Plus: The correspondence form of training is cheaper than full-time, and you certainly will not have to take an educational loan, and, therefore, will receive a diploma without debts, which will need to be given back for another year.