158 ^|

A Handbook of Biology

MËÏØSÏS ÏÏ



It resembles the mitosis. It has the following phases:

Prophase II:

It is initiated immediately after cytokinesis usually

before the chromosomes have fully elongated The

chromosomes again become compact. Nucleolus and

nuclear membrane disappear in both nuclei.

01

Metaphase II:

The chromosomes align at the equator and the

microtubules from opposite poles of the spindle get

attached to the kinetochores of sister chromatids.

02

03

Anaphase II:

It begins with the simultaneous splitting of the

centromere of each chromosome (which was holding

sister chromatids together). Thus they move toward

opposite poles of the cell.

Telophase II:

The two groups of chromosomes once again get

enclosed by a nuclear envelope; (AIPMT 1988)

cytokinesis follows resulting in the formation of

tetrad of cells i.e., 4 haploid daughter cells

04