Question

The replication of centrioles occurs during

Answer 1

The centriole replication cycle. G1 cells possess a single centrosome containing a pair of centrioles embedded in an amorphous pericentriolar material. In most somatic cells, centriole duplication occurs during S phase and is marked by the formation of procentrioles at the proximal end of each parental centriole.

Answer 2

Hey mate, here is your answer ===
The replication of centrioles occurs during S phase and with the formation of procentrioles.
Hope it helps u dear :)