Question

An organism has two pairs of chromosomes (i.e., chromosome number = 4). Diagrammatically represent the chromosomal arrangement during different phases of meiosis-II.

Answer 1

The chromosomal arrangement at Meiosis-II

Meiosis-II has 4 phases:

● Prophase -II
● Metaphase-II
● Anaphase-II
● Telophase-II

Pro phase-II

Prophase-II is characterised by the complete condensation of chromatin to form chromosomes. Two compact chromosomes will be present in each of the daughter cells after the separation of homologous chromosomes in meiosis-I.

Metaphase-II

Metaphase-II is characterised by the alignment of chromosomes at the equatorial plate attached to the microtubules from the opposite poles.

Anaphase-II

Anaphase-II is characterised by the separation of the two sister chromatids of chromosomes. Sister chromatids of each chromosome will move towards the opposite poles.

Telophase-II

Telophase-II is characterised by the decondensation of chromosomes to chromatin and the reappearance of the nuclear membrane and nucleolus. Thus, at each pole of the cell, one chromatid of each chromosome will be surrounded by the nuclear envelope.