Mitotic Chromosomes & Spindle Apparatus — NEET Biology
📚 Practice Concept• Chromosomal material condenses to form compact mitotic chromosomes. Chromosomes are seen to be composed of two chromatids attached together at the centromere. • Centrosome which had undergone duplication during interphase, begins to move towards opposite poles of the cell. Each centrosome radiates out microtubules called asters. The two asters together with spindle fibres forms mitotic apparatus.
Which of the following statements regarding the formation and components of the mitotic apparatus in animal cells during mitosis is NOT correct?
View solution & NCERT explanation
Correct answer: D — In animal cells, the mitotic apparatus forms at the metaphase plate.
The core concept is the formation of the aster and mitotic apparatus. Statement A is correct; the centrosome duplication occurs during the S phase of interphase. Statement B is correct; each centrosome radiates out microtubules called asters. Statement C is correct; the two asters together with spindle fibres form the mitotic apparatus. Statement D is incorrect because the mitotic apparatus, formed by asters and spindle fibres, is assembled during prophase (and further organizes), and its spindle fibres attach to chromosomes to move them to the metaphase plate; the apparatus itself is not formed *at* the metaphase plate but is responsible for establishing it.
What does NCERT say about Chromosomal material condenses to?
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