The period occupied by a cell between the post-mitotic gap phase and semi-autonomous organelles duplication is characterized by:

Q.

The period occupied by a cell between the post-mitotic gap phase and semi-autonomous organelles duplication is characterized by:

Q. Maximum cytoplasmic growth and duplication of semi-autonomous organelles occur in ___________________.

Q. (a) What is karyokinesis? Name the four main phases that constitute karyokinesis.

(b) From the phases mentioned in (a) select the phase that is characterized by the following:
(i) The chromosomes arrange themselves upon the equator of the spindle.
(ii) The nucleoli and the nuclear membrane disappear.
(iii) The nucleolus reappears.
(iv) The sister chromatids undergo mutual repulsion and split longitudinally into two halves.
(v) The centrioles divide and move toward the poles.
(vi) Migration of the sister chromatids toward the poles is initiated. [5 MARKS]

Q. Sir
How does mitosis occur in plants without centrioles and centrosomes. We are taught that spindle fibres are formed by centrioles moving to opposite poles of the cell and plant cells don't posses centrioles. Then how is the spindle apparatus is formed and constricted to divide the chromatids.