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Question
Assertion :Small disc-shaped structure at the surface of the centromeres are called kinetochores. Reason: Kinetochores serve as the site of attachment of spindle fibres to the centromeres
Assertion :Small disc-shaped structure at the surface of the centromeres are called kinetochores. Reason: Kinetochores serve as the site of attachment of spindle fibres to the centromeres
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In metaphase discontinuous fibres radiate out from two spindle poles and get connected to the disc shaped structure at the surface of the centromere called kinetochores.These are called chromosome fibres or tractile fibrils. A kinetochore is a complex protein structure that is analogous to a ring for the microtubule hook; it is the point where microtubuies attach themselves to the chromosome.
In metaphase discontinuous fibres radiate out from two spindle poles and get connected to the disc shaped structure at the surface of the centromere called kinetochores.These are called chromosome fibres or tractile fibrils. A kinetochore is a complex protein structure that is analogous to a ring for the microtubule hook; it is the point where microtubuies attach themselves to the chromosome.
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