Assertion :Small disc-shaped structures at the surface of the centromeres are called kinetochores. Reason ::Kinetochores serve as the sites of attachment of spindle fibres to the centromeres.

Question

Assertion :Small disc-shaped structures at the surface of the centromeres are called kinetochores. Reason ::Kinetochores serve as the sites of attachment of spindle fibres to the centromeres. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

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 microtubules attach themselves to the chromosome.

Q. Assertion :Small disc-shaped structures at the surface of the centromeres are called kinetochores. Reason ::Kinetochores serve as the sites of attachment of spindle fibres to the centromeres.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion :Small disc-shaped structures at the surface of the centromeres are called kinetochores.
Reason ::Kinetochores serve as the sites of attachment of spindle fibres to the centromeres.