Question

Choose the correct answers from the alternatives given :
It is important that the centromere does not divide until the end of metaphase because it

• A. contains the genes that control prophase
• B. holds the replicated DNA molecules together
• C. is connected to the nuclear membrane
• D. produces the spindle fibres

Answer 1

The correct option is B holds the replicated DNA molecules together

• The DNA that was replicated during the Sphase of the interphase are held together by the centromere till the chromosome are detached from each other to be pulled towards the poles of the dividing cells.
• Metaphase is the second phase of the mitosis where the chromosomes after the condensation and disappearance of the nuclear membrane are lined at the metaphase or the equatorial plate in the middle of the dividing cell
• At the end of the metaphase the spindle fibers from the centrioles are attached to the kinetochore which are present beside the centromere in the middle of the chromosome.
• So when the chromosomes are pulled towards the poles in the anaphase the centromere are not required to hold the chromosomes together and so the centromere are also divided but at the end of the metaphase where the chromosomes are ready to be pulled towards the pole of the dividing cells.
• Therefore the correct answer is option 'holds the replicated DNA molecules together'.