Question

explain the meiosis ll briefly​

Answer 1

Answer:

Meiosis ll :

Meiosis ll is similar to mitosis, i.e., equational division, but not an exact copy of mitosis because mitosis occurs in diploid somatic cell but meiosis ll always occurs in haploid germ cells. Mitosis is always followed by DNA replication, but meiosis ll is not followed by DNA replication. The daughter cell formed after meiosis ll are neither similar to each other nor similar to the parent cell.

The main event which occurs during meiosis ll is the separation of the chromatid of the univalent chromosomes present in the daughter cell formed after meiosis l. The chromatid present in the univalent chromosomes differ from each other due to crossing over, Meiosis ll is divided into four phases :

1. Prophase ll : Prophase ll is a short phase where the chromatids of the univalent condenses. The chromatin material again becomes compact. The nucleolus and the nuclear envelope disintegrate and disappear.
2. Metaphase ll : The univalent, i.e., chromosomes align themselves at the equator, in the metaphase ll. The microtubules from the opposite poles extend towards the equator and attaches at the Kinetochore of the chromatids.
3. Anaphase ll : During this phase, the centromere holding the two chromatids splits and allow the separation and movement of the two chromatids. Chromatids move to the opposite poles.
4. Telophase ll : During this phase,the chromatids reach the poles and start uncoiling. They decondense and become thin. The spindle fibres degenerate. The nuclear membrane and nucleolus reappear and four haploid nuclei are formed. The telophase ll is now followed by cytokinesis which divides the cytoplasm and forms four individual haploid cells.

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Answer 2

Answer:

Explanation:

The two cells produced in meiosis I go through the events of meiosis II in synchrony. During meiosis II, the sister chromatids within the two daughter cells separate, forming four new haploid gametes. ... Therefore, each cell has half the number of sister chromatids to separate out as a diploid cell undergoing mitosis..