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Find the odd one for G₁ phase.
Solution:
The G₁ phase (Gap 1) is the first phase of interphase in the cell cycle. During G₁, the cell grows, synthesizes proteins and RNA, and duplicates most of its organelles. DNA replication does not occur in G₁. Centriole duplication, which is necessary for spindle formation during mitosis, occurs during the S phase (synthesis phase), not the G₁ phase. Therefore, centriole duplication is the odd one out for the G₁ phase.