Final answer:
Interphase in an onion root tip cell involves three stages: G1, S, and G2. During G1, the cell accumulates DNA building blocks and energy reserves. During S phase, the cell duplicates its nuclear DNA.
Step-by-step explanation:
During interphase, the cell undergoes normal growth processes while also preparing for cell division. The three stages of interphase are called G1, S, and G2.
In the G1 phase, the cell is actively accumulating the building blocks of chromosomal DNA and associated proteins, as well as energy reserves to replicate each chromosome in the nucleus.
The S phase, or synthesis of DNA, is when the cell duplicates its nuclear DNA.