PATHOLOGY

Detailed explanation-1: -The nucleus during mitosis. Micrographs illustrating the progressive stages of mitosis in a plant cell. During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.

Detailed explanation-2: -Prophase is the first stage of mitosis, during which the cell begins to position itself in order to separate the chromatids and divide. During prophase, the nuclear envelope and nucleolus are dissolved and the chromosomes condense. The centrioles and spindle fibers begin to form at opposite poles of the cell.

Detailed explanation-3: -Prophase. The first and longest phase of mitosis is prophase (Figure below). During prophase, chromatin condenses into chromosomes, and the nuclear envelope, or membrane, breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles (sides) of the cell.

Detailed explanation-4: -Metaphase. During metaphase, spindle fibers fully attach to the centromere of each pair of sister chromatids. As you can see in Figure 7.3. 5, the sister chromatids line up at the equator, or center, of the cell.

Detailed explanation-5: -Centrioles split and move to the opposite ends of the cell at the poles towards the end of Prophase.