AP BIOLOGY

Detailed explanation-1: -Complete answer: Chromosome replication occurs during S Phase . The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is liable for the synthesis or replication of DNA.

Detailed explanation-2: -Chromosome Dynamics During the Cell Cycle. The G1, S, and G2 phases are often referred to as interphase, and the M phase is the mitotic phase. During interphase, chromosomes are replicated, and during mitosis they become highly condensed and then are separated and distributed to the two daughter nuclei.

Detailed explanation-3: -G2 phase, Gap 2 phase, or Growth 2 phase, is the third subphase of interphase in the cell cycle directly preceding mitosis. It follows the successful completion of S phase, during which the cell’s DNA is replicated.

Detailed explanation-4: -G2 Phase. G2 phase is the final phase of interphase, in which the cell synthesises a variety of proteins. Microtubules, a vital protein in mitosis, is also synthesised. G2 is also the final growth before M phase, a checkpoint of sorts to ensure intracellular components have been properly replicated.