CELL DIVISION
THE CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Two identical copies of the same chromosome formed by DNA replication, attached to each other by a structure called the centromere.
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The cytoskeletal structure of eukaryotic cells that forms during cell division to separate sister chromatids between daughter cells.
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A thread-like structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
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A chromosome that has been newly copied, but they are both still joined together.
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Detailed explanation-1: -The spindle apparatus is vaguely ellipsoid in cross section and tapers at the ends. In the wide middle portion, known as the spindle midzone, antiparallel microtubules are bundled by kinesins. At the pointed ends, known as spindle poles, microtubules are nucleated by the centrosomes in most animal cells.
Detailed explanation-2: -Microtubules form the mitotic apparatus (mitotic spindle) whose main function is to separate chromosomes to the newly dividing cells (Fig.
Detailed explanation-3: -The spindle apparatus is a structure of the eukaryotic cytoskeleton involved in mitosis and meiosis, often referred to as the mitotic spindle during mitosis and the meiotic spindle during meiosis. Its function is to segregate chromosomes during cell division (either mitosis or meiosis) to the daughter cells.
Detailed explanation-4: -Spindle fibres constitute mitotic and meiotic spindle during cell division. They are formed by microtubules and play an important role during nuclear division. They are responsible for the segregation of sister chromatids and movement of chromosomes during mitotic and meiotic division.
Detailed explanation-5: -The mitotic spindle is a structure that forms during cell division and separates duplicated chromosomes. In eukaryotic cells, the mitotic apparatus is composed of two centrosomes and spindle microtubules (Figure 43.9).