NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice
The following statements describe events during the mitotic cell cycle. What is the correct order of these events in the mitotic cell cycle? I. Chromosomes migrate to opposite poles of the spindle. II. Chromosomes arrange themselves at the equator of the spindle. III. Chromosomes condense and the nuclear membrane disappears. IV. Centromeres divide.
Options
- AII → III → IV→ I
- BIII → II → IV → I
- CIII → IV → II → I
- DIV → II → I → III
Correct answer
B. III → II → IV → I
Step-by-step solution
During mitosis, the chromosomes condense and nuclear membrane disappears at prophase. They are attached to spindle fibers and are brought to the equator at metaphase. Centromeres divide and one chromatid of each chromosome is pulled to opposite sides of the cell at anaphase. Chromosomes reach the poles, they decondense and form nuclear membrane at telophase.