AP BIOLOGY

Detailed explanation-1: -In a normal somatic cell cycle centrosome duplication is first visible during early S-phase, when a new procentriole assembles next to the proximal end of each parental centriole. As the cell progresses through S and G2 phases, daughter centrioles elongate until they reach the length of their parents.

Detailed explanation-2: -During the second gap phase, or G 2start subscript, 2, end subscript phase, the cell grows more, makes proteins and organelles, and begins to reorganize its contents in preparation for mitosis.

Detailed explanation-3: -Initially in G1 phase, the cell grows physically and increases the volume of both protein and organelles. In S phase, the cell copies its DNA to produce two sister chromatids and replicates its nucleosomes. Finally, G2 phase involves further cell growth and organisation of cellular contents.

Detailed explanation-4: -The two centrioles, carrying their own procentriole and a portion of the pericentriolar material, separate from each other in G2 (Figure 3). The movement is driven by the activity of Eg5 kinesin, a microtubule associated motor protein.

Detailed explanation-5: -G2 is the shortest phase of interphase. It is when organelles and proteins necessary for cell division are produced. The cell requires a bunch of proteins and other stuff to separate the chromosomes and divide the cell in half. All of these materials are produced during G2.