PATHOLOGY

Detailed explanation-1: -Answer: Option D Solution: Replication of DNA does not occur in mitosis. Replication of DNA occurs during S phase, an entirely different phase of cell division.

Detailed explanation-2: -Which of the following is not involved in mitosis? Explanation: Crossing over is the only answer choice that does not occur during mitosis. Crossing over occurs during prophase I of meiosis and involves swapping of genetic information between homologous chromosomes.

Detailed explanation-3: -The correct answer choice is C. Replication of the nucleus does not happen during interphase.

Detailed explanation-4: -DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell.

Detailed explanation-5: -During mitosis (nuclear division), the chromosomes condense, the nuclear envelope of most cells breaks down, the cytoskeleton reorganizes to form the mitotic spindle, and the chromosomes move to opposite poles. Chromosome segregation is then usually followed by cell division (cytokinesis).