LABORATORY REVIEW
MITOSIS AND MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They break down the nuclear membrane of the cell duringprophase.
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They pull the chromosomes apart during anaphase so each newcell will have a copy of the DNA.
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They push together chromosomes during metaphase so they areall lined up in the middle.
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They pinch the cytoplasm together to make 2 separate cells.
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Detailed explanation-1: -Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis.
Detailed explanation-2: -The spindle fibers ensure that sister chromatid s will separ ate and go to different daughter cells when the cell divides. Chromosomes, consisting of sister chromatids, line up at the equator or middle of the cell during metaphase.
Detailed explanation-3: -Spindle fibres attach to a protein complex, called the kinetochore, which surrounds the centromere of the chromosome. During anaphase, they then pull the sister chromatids, that make up a chromosome, away from each other by shortening towards the centrosome.
Detailed explanation-4: -Mitotic spindle, present at the poles of the cells, is a structure made of microtubules (spindle fibres). Its role is to separate the chromosomes. The spindle fibres attach to chromosomes during metaphase and pull the chromatids towards opposite poles during anaphase.