Question

By the end of prophase, each of the following has occurred except ____.
Question 7 options:

tighter coiling of the chromosomes

breaking down of the nuclear envelope

disappearing of the nucleolus

lining up of chromosomes in the cell

Answer 1

By the end of prophase in Mitosis, each of the following has occurred except lining up of the chromosomes in the cell.

Explanation:

Prophase is divided into 2 phases early and late prophase.

Early prophase: The nuclear membrane starts dissociating, centrioles starts to migrate to the opposite poles, chromatin fibres (4) becomes thicker and condensed,

Late Prophase: From the centrioles that are at the opposite poles, Spindle fibres and 2 astral rays are formed. The spindle fibres get attached to the chromosomes.

The prophase will be followed by the metaphase, the chromosomes formed will be adjusted at the equatorial plate.

Answer 2

The description 'lining up of chromosomes in the cell' does NOT occur by the end of prophase.

• Mitosis is a cell division by which one cell is divided to generate two genetically identical daughter cells.

• This type of cell division has four main stages: prophase, metaphase, anaphase and telophase.

• During prophase, the chromatin condenses, the nuclear envelope disintegrates, the nucleolus disappears and centrioles move to opposite ends of the cell (animal cells).

• During metaphase, the chromosomes align at the equator plate of the cell in order to travel to opposite poles in anaphase.

In conclusion, the description 'lining up of chromosomes in the cell' does NOT occur by the end of prophase.

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