Question

Centrioles duplicate during ______ in the ______.

• A. $G_2$ phase, nucleus
• B. $G_2$ phase, cytoplasm
• C. S phase, cytoplasm
• D. S phase, nucleus

Answer 1

The correct option is C S phase, cytoplasm

Centrioles are organelles that lie near the nucleus in the cytoplasm of animal cells. They help in cell division by organizing spindle fibres. Centrioles duplicate during the S phase of the cell cycle and it results in the formation of four centrioles prior to cell division. They help in distributing the duplicated genetic material equally. Also, during S phase, DNA replication occurs inside the nucleus. During the G${}_2$ phase, there is overall cell growth and proteins needed for cell division like tubulin are synthesized.