Which of the following is key event of anaphase of mitotic division?

Chromosomes are moved to spindle equator and get aligned through spindle fibres to both poles

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Centromeres split and chromatids separate

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Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements

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Both (b) and (c)

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Solution

The correct option is A Centromeres split and chromatids separate
During the initial stage of mitosis, the centromere splits from the middle and two chromatids get separated out. The chromatid more towards opposite pole due to repulsive forces which are known as anaphasic moments. the anaphasic movements are brought about by the repolymerization of continuous fibres and depolymerization of chromosomal fibres.
Chromosomes are best studied at anaphase.

So, the correct option is 'Centromeres split and chromatids separate'

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Similar questions

Q. Which of the following events takes place during anaphase stage of mitosis?
I. Spindle fibres attach to kinetochores of chromosomes
II. Centromeres split and chromatids separate
III. Chromatids move to opposite poles
IV. Nucleolous, Golgi complex and E.R. reform

Q. The events shown below occur during different phases:
a. Centromere splits, chromatids separate and move to opposite poles, chromatids are now called chromosomes.
b. Chromosomes cluster at opposite poles, decondensation of chromosomes, reappearance of the nuclear membrane, golgi bodies, and the ER.
c. Chromosomal replication.
d. Kinetochores attach to spindle fibres and chromosomes are arranged at the equatorial plate.
e. Condensation of chromosomal materials.

Which of the following correctly identifies each of the phases described?

________ is characterised by all the chromosomes coming to lie at the equator, with one chromatid connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole.

Match the following stages during Mitotic cell division with the key changes:

$\begin{matrix} Column I & Column II i. Prophase & a. Formation of 2 daughter cells, preparation for next division. ii. Metaphase & b. Organelles disappear, formation of chromosomes. iii. Anaphase & c. Spindle fibres, chromosomes at equatorial plate. iv. Telophase & d. Splitting of chromatids, chromosomes move towards poles. v. Interphase & e. Spindle fibres disappear, Cytokinesis follows. \end{matrix}$

Q. Match the events given in column A with the phase in mitotic cell division in column B

Column 'A'	Column 'B'
(a) Chromosomes get arranged in a horizontal plane at the equator.	1.Anaphase
(b) Daughter chromosomes move to the opposite poles of a spindle.	2. Prophase
(c) Chromosomes become visible as fine long threads.	3. Telophase
(d) Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network	4. Metaphase

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