Question

In which of the following phases of karyokinesis do chromosomes align at the equatorial plate, and spindle fibres are completely formed?

• A. Prophase
• B. Metaphase
• C. Anaphase
• D. Telophase

Hint:

Metaphase is the stage where the spindle fibers align chromosomes at the center before they are pulled apart.

Answer 1

The Correct Option is B

The alignment of chromosomes at the equatorial plate and the complete formation of spindle fibers occur during metaphase of karyokinesis.

Metaphase is a crucial phase in both mitosis and meiosis, characterized by the following key events:

• Chromosome alignment: The chromosomes, which have already condensed and are visible, align at the cell's equatorial plate, also known as the metaphase plate. This alignment ensures that the chromosomes are properly positioned for separation.
• Spindle fibers: The spindle fibers, which are microtubules, are fully formed and extend from the centrosomes at opposite poles of the cell. They attach to the centromeres of the chromosomes via the kinetochores.

This phase is critical for ensuring that each daughter cell will receive the correct number of chromosomes during the subsequent phase, anaphase, where the chromosomes will be pulled apart toward opposite poles of the cell.