Question

Replication of centriole occurs during

• A. Interphase
• B. Prophase
• C. Late prophase
• D. Late telophase

Answer 1

Answer: (A)

Interphase

Answer 2

Replication of centriole occurs during G1 phase of interphase. The interphase is thelongest phase of the cell cycle and is divided into three phases G1 (Growth Phase), Sn(Synthesis Phase), and G2 (Second Growth Phase). Replication of DNA, a biosynthetic activity is a characteristic of the S-phase of the interphase.

Centriolesfacilitate the formation of the spindle fibers. These separate the chromosomes during cell division. The paired centrioles move towards the opposite poles of the nucleus during cell division. However, in the S-phase of the interphase, the centrioles are separate and undergo duplication to produce two pairs of centrioles.

Centriole Duplication Cycle

For the other options:

• Prophase- Centriole pairs move towards opposite poles and form astral rays.
• Late Prophase- Astral rays grow and attach themselves to the chromomere.
• Late Telophase- Chromatids from both sides reach the opposite poles.

Also Read: Stages of Meiosis