Question

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

(a) Condensation $\to$ Nuclear membrane disassembly $\to$ Arrangement at equator $\to$ Centromere division $\to$ Segregation $\to$ Telophase

(b) Condensation $\to$ Crossing over $\to$ Nuclear membrane disassembly $\to$ Segregation $\to$ Telophase

(c) Condensation $\to$ Arrangement at equator $\to$ Centromere division $\to$ Segregation $\to$ Telophase

(d) Condensation $\to$ Nuclear membrane disassembly $\to$ Crossing over $\to$ Segregation $\to$ Telophase

Answer 1

Ans : (a) Condensation → Nuclear membrane disassembly → Arrangement at equator → Centromere division → Segregation → Telophase

Explanation :

Mitosis is the equational division of nucleus in which chromatin fibers first condense to form chromosome at prophase and nuclear membrane start to disappear. During metaphase, all the chromosome aligned at the equator and attached to the spindle fiber with centromere of the chromosome. During anaphase, division of centromere and segregation of chromosome occurs at opposite pole of the nucleus and then telophase occurs.