Question

Imagine a prometaphase chromosome pair that is attached to one spindle pole. Which of the following would happen if both arms of the chromosome are severed with a strong laser beam?
A) All chromosome fragments (the centromere-containing fragment and the arm fragments) would be pushed away from the pole
B) Only the two arm fragments would be pulled toward the pole. The kinetochore-containing fragment would remain stationary
C) The kinetochore-containing fragment would be pulled toward the pole. The two arm fragments would move away from the pole
D) The kinetochore-containing fragment would move away from the pole, but the two arm fragments would be pulled toward the pole
E) All chromosome fragments would be pulled toward the pole

Answer 1

Answer: the correct answer is C) The kinetochore-containing fragment would be pulled toward the pole. The two arm fragments would move away from the pole

Explanation:

A kinetochore is a disc-shaped protein structure linked with duplicated chromatids in eukaryotic cells where the spindle fibers link during cell division to pull sister chromatids apart. The kinetochore assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis. Its proteins also help to hold the sister chromatids together and play a role in chromosome editing.

Answer 2

Answer:（C）is the answer.

Explanation:

The direction of the force on the two fragment can be seen from the picture.