Question

The centrosome duplicates during the

• A. S-phase of cell cycle
• B. $G_1$- phase cell cycle
• C. $G_2$-phase of cell cycle
• D. Prophase of cell cycle

Answer 1

The correct option is A S-phase of cell cycle

• The centrosomes are the centers from which the spindle network arises.
• The spindle network is required for holding the chromosomes during the cell division.
• The centrosomes are duplicated by the end of the S-phase of the interphase. The centrosome divides only once in a cell cycle.
• The duplicated centrosomes are held together in the G${}_2$ phase. In the prophase, the centrosomes start to travel to the opposite poles.

Thus, the correct answer is option A.