Final answer:
The Gap 1 (G₁) phase is the interval post-mitosis leading up to DNA synthesis, while the Gap 2 (G₂) phase is the period after DNA synthesis leading up to the next mitosis.
Step-by-step explanation:
The interval between the completion of mitosis and the beginning of DNA synthesis is called the Gap 1 (G₁) phase, and the interval between the end of DNA synthesis and the beginning of mitosis is called the Gap 2 (G₂) phase. The G₁ phase is characterized by cell growth and biochemical activity in preparation for DNA replication, while the G₂ phase involves further growth and final preparations for mitosis. Both phases are part of the cell cycle's interphase, which also includes the S phase, where DNA replication occurs.
The interval between the completion of mitosis and the beginning of DNA synthesis is called Gap 1 (G₁) phase, and the interval between the end of DNA synthesis and the beginning of mitosis is called Gap 2 (G₂) phase.