AP BIOLOGY

Detailed explanation-1: -In prophase, the replicated chromosomes pairs get compact and condense; these paired chromosomes are considered as sister chromatids that attach together by centromeres. Spindle fibers made of microtubule proteins start to appear in this stage that are found in both poles of the cell.

Detailed explanation-2: -The spindle fibers form during prophase. During metaphase of cell division, the spindle fibers radiate from the centrioles at the opposite poles. Some of them attach to the kinetochores of the chromosomes while others bind to the arms of the chromosomes, still others continue to grow.

Detailed explanation-3: -In the first stage, prophase, each chromosome becomes condensed and more visible, and there is the breakdown of the nuclear membrane and appearance of spindle fibers. In the next phase, metaphase, the chromosomes line up along the metaphasic plate.

Detailed explanation-4: -Chromosomes become visible during prophase. Chromatin is in its least condensed stage during the interphase stage. It begins its condensation during the prophase stage and is visible until the end of cell division. Q.

Detailed explanation-5: -During prophase, the chromosomes in a cell’s nucleus condense to the point that they can be viewed using a light microscope.