Question

Choose the correct answers from the alternatives given :
The thread like structures that begin to radiate from each centromere by the end of prophase are

• A. aster microtubules
• B. spindle microtubules
• C. kinetochore microtubules
• D. polar microtubules

Answer 1

The correct option is C kinetochore microtubules

• Prophase is the third stage of the mitosis where the chromosomes which were lined up at the metaphase plate in the metaphase are to be pulled towards the pole of the dividing cells.
• The centrioles which are present at the pole of the dividing cells produce spindle fibers which are will help pull the chromosomes towards the pole .
• These spindle fiber will attach to the kinetochore which is present with the centromere in the middle of the chromosome,
• The kinetochore also produces microtubles which will attach will the incoming spindle fibers forming a bond so that they can be pulled towards the pole.
• After reaching the pole the fibers will distangle from the kinetochore and disappear leaving the chromosomes to decondense and formation of the nuclear membrane around them .
• Therefore the answer option 'kinetochore microtubules' is correct.