End of prophase is marked by?

Initiation of condensation of chromosomal material

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Complete disintegration of nuclear membrane

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Reappearance of ER, Golgi body, nucleolus and nuclear envelop

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Alignment of chromosomes at the equator

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Solution

The correct option is B Complete disintegration of nuclear membrane
B. Complete disintegration of nuclear membrane
EXPLANATION: Mitosis begins at prophase with the thickening and coiling of the chromosomes. The end of the prophase is marked by the beginning of the organization of a group of fibres to form a spindle and the disintegration of the nuclear membrane.

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Similar questions

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?

Q. Match the following columns w.r.t. mitosis and select the correct option.

	Column I		Column II
(a)	Prophase	(i)	Re-appearance of nuclear membrane
(b)	Metaphase	(ii)	Condensation of chromatin
(c)	Anaphase	(iii)	Separation of chromatids
(d)	Telophase	(iv)	Chromosomes align on equator

During _______, a spindle appears while the nuclear envelope fragments and the nucleolus disappears. Only one set of sister chromosomes from each pair of homologous chromosomes is present.

Q. During ___, a spindle appears while the nuclear envelope fragments and the nucleolus disappears. Only one set of sister chromosomes from each pair of homologous chromosomes is present.

Q. Nucleolus disappears and the nuclear envelope breaks down by the end of

A - Diakinesis B - Prophase-II
C – Telophase D - Pachytene

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