Question

5. Enumerate the various changes that occur in the
nucleus of the cell during (a) prophase (b)
anaphase of mitotic division.​

Answer 1

Explanation:

During prophase - the nuclear membrane remain intact but nucleolus starts to break down.

During anaphase - chromatids goes towards two opposite pole that means chromatids ir chromosomes equally distributed into two daughter nucleus

Answer 2

Answer:

(A) During the prophase..

•the chromosomes will become short and thick and are clearly visible inside the nucleus

•each chromosome has already duplicated to form two chromatids

•The two sister chromatids remain attached to each other at a small region called centromere

•the centrosome splits into two along with simultaneous duplication of the centrioles contained in it..the daughter centrioles move apart and occupy opposite poles of the cell

Each centriole is surrounded by radiating rays and is termed aster

• a no of fibres appear bw the two daughter centrioles which are called spindle fibres

•the nuclear membrane and the nucleolus disappear

•the duplicated chromosomes starts moving toward the equator of the cell

(B)

During anaphase...

Anaphase begins when the duplicated centromeres of each pair of sister chromatids separate, and the now-daughter chromosomes begin moving toward opposite poles of the cell due to the action of the spindle. ... At the end of anaphase, a complete set of chromosomes has assembled at each pole of the cell.

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