Question

chromosomes are duplicated during what portion of the cell cycle?○ s phase○ g2 phase○ mitotic phase○ prophase○ g1 phase

Explanation:

The cell cycle's interphase includes G1, S, and G2 phases. Chromosome duplication (DNA replication) specifically occurs during the S (Synthesis) phase. G1 is for cell growth, G2 prepares for mitosis, the mitotic phase involves cell division, and prophase is the first stage of mitosis.

Answer:

S phase