Question

The phase of shortest duration is

• A. S phase
• B. Prophase
• C. Metaphase
• D. Anaphase

Answer 1

The correct option is D Anaphase

Anaphase is the shortest phase of mitosis. During anaphase, the arranged chromosomes at the metaphase plate migrate towards their respective poles. Before this migration started, chromosomes are divided into sister chromatids, by the separation of joined centromere of two sister chromatids of chromosomes. During migration, sister chromatids moved towards opposite poles of the cell by the constriction of spindle fibers or kinetochore microtubules. Due to this movement the size of chromosomes is changed, e.g., metacentric looks like V-shaped whereas sub-metacentric looks like J-shaped. This movement, i.e., migration continues till the chromosomes reached to the poles and their segregation completes.
So, the correct answer is option D.