Question

unit 3 organism growth
this is a model of the cell cycle. in which phase does the dna double?
a. m
b. g₁
c. g₂
d. s

Explanation:

• In the cell cycle, the S (Synthesis) phase is when DNA replication occurs, meaning DNA doubles.
• The M phase is for mitosis (cell division).
• \(G_1\) is the first gap phase for cell growth and preparation.
• \(G_2\) is the second gap phase for further growth and checkpoints before mitosis.

Answer:

D. S