LABORATORY REVIEW
MITOSIS AND MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Double stranded chromosomes are joined together by spindle fibres
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Double stranded chromosomes are pulled apart by spindle fibres
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Single stranded chromosomes are joined together by spindle fibres
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Single stranded chromosomes are pulled apart by spindle fibres
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Detailed explanation-1: -Anaphase. During anaphase, sister chromatids separate and the centromeres divide. The sister chromatids are pulled apart by the shortening of the spindle fibers. This is like reeling in a fish by shortening the fishing line.
Detailed explanation-2: -Anaphase I: In anaphase I, the attachment of the spindle fibers is complete. The homologous chromosomes are pulled apart and move towards opposite ends of the cell.
Detailed explanation-3: -Anaphase is the fourth phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells.
Detailed explanation-4: -During anaphase each chromosome present in metaphase separates into two chromosomes, each with a single double-stranded DNA molecule. Therefore, during anaphase the chromosome number is temporarily doubled until the cells finish the process of cell division.
Detailed explanation-5: -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.