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Question:

Which of the following options gives the correct sequence of events during mitosis?

Condensation→arrangement at equator→centromere division→segregation→telphase

Condensation→nuclear membrane disassembly→crossing over→Segregation→telophase

Condensation→crossing over→nuclear membrane disassembly→segregation→telophase

Condensation→nuclear membrane disassembly→arrangement at equator→centromere division→segregation→telophase

Solution:

Mitosis is the equational division of the nucleus in which chromatin fibers first condense to form chromosomes at prophase, and the nuclear membrane starts to disappear. During metaphase, all the chromosomes align at the equator and attach to the spindle fiber with the centromere of the chromosome. During anaphase, division of the centromere and segregation of chromosomes occurs at opposite poles of the nucleus, and then telophase occurs. Thus, the correct answer is option D.