Question

How does meiosis-I differ from meiosis-II?

Answer 1

The process of cell division that occurs in the reproductive cells of the living organisms helps in the genetic variation by its two phases which are further divided into four phases each and the second phase is similar to the mitotic division.

Complete step by step answer:

Meiosis-I	Meiosis-II
It is divided into four phases namely prophase-I, metaphase-I, anaphase-I, and telophase-I	It is divided into four phases namely prophase-II, metaphase-II, anaphase-II, and telophase-II
Leptotene, zygotene pachytene, diplotene, and diakinesis are the five phases of prophase-I. At the end of prophase-I nucleolus disappear and the nuclear membrane also breaks down	At the end of the prophase-II nuclear membrane disappear and the chromosomes again become compact.Meiosis-II is similar to mitotic division
At metaphase-I, at the equatorial plate, the bivalent chromosomes align	At metaphase-II, at the equator, the chromosomes align and at opposite poles of the spindle the microtubules get attached to the kinetochores of the sister chromatids
At anaphase I, the separation of homologous chromosomes takes place, while the sister chromatid remains attached at the centromeres.	Anaphase-II starts with the splitting of the centromere of each chromosome simultaneously.
The nuclear membrane and nucleolus reappear at the end of telophase-I. Cell get ready to enter into meiosis-II	Telophase-II is the end phase of meiosis where two groups of chromosomes once again get enclosed by the nuclear envelope.
Two haploid daughter cells are formed.	Four haploid daughter cells are formed

Additional information:
- Prophase of the first meiotic division is the longest and more complex phase of the meiosis.
- Meiosis is called reduction division because at the end of the meiotic division the chromosome number in the daughter cell is reduced to half of the parent chromosome.

Note: The conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organisms by meiosis
Genetic variability in the population of an organism from generation to generation is increased by meiosis.