AP BIOLOGY

Detailed explanation-1: -At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm.

Detailed explanation-2: -Prophase is the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses.

Detailed explanation-3: -During the prophase stage, the chromosomes condense into an X-shaped structure. Each chromosome is composed of two sister chromatids with the same information. Chromosomes are paired, both copies of chromosome 1 are combined, and both copies of chromosome 2 are grouped together.

Detailed explanation-4: -Nuclear membrane starts disappearing at the start of mitosis and by the late prophase it disappears completely along with the major cell organelles. The nuclear membrane disappears presumably to allow more space for karyokinesis and proper separation of chromatids.

Detailed explanation-5: -Mitosis: In Summary In prophase, the nucleolus disappears and chromosomes condense and become visible.