Home
Class 12
BIOLOGY
Assertion : Kinetochor helps in the move...

Assertion : Kinetochor helps in the movement of chromosomes.
Reason : It has points for attachment of microtubules .

A

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

B

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

C

If the assertion is true but the reson is false

D

If both the assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
The surface of cenfromere bears a special trilaminar plate called kinetochore. Kinetochore has points for attachment of microtubules. Microtubules produce chromosome fibres or tactile fibrills require for the movement of chromosomes during anaphase.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • MOLECULAR BASIS OF INHERITANCE

    ERRORLESS |Exercise Molecular Basis Of Inheritance|469 Videos

  • REPRODUCTION IN ORGANISMS

    ERRORLESS |Exercise Reproduction In Organisms|116 Videos

Similar Questions

Explore conceptually related problems

Assertion : Diamond is the hardest substance on the earth. Reason : It has melting point.

Assertion : If pollen mother cells has 21 chromosomes. Reason : Pollens are formed after meiosis in pollen mother cells

Knowledge Check

  • Assertion :- Kinetochore is essential for cell division. Reason:- Kinetochores serve as the sites of attachment of spindle fibres to the chromosome.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
    C
    If Assertion is True but the Reason is False
    D
    If both Assertion & Reason are false.

  • Assertion :- Kinetochore is essential for cell division. Reason :- Kinetochores serve as the sites of attachment of spindle fibres to the chromosome.

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
    B
    If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is False.
    D
    If both Assertion & Reason are false.

  • Reason of chromosomal movement in Anaphase is

    A
    Astral rays
    B
    Centrioles
    C
    Kinetochore
    D
    Kinetochore and spindle fibres

    • Similar Questions

    Explore conceptually related problems

    Assertion : Plants having odd number of sets of chromosomes are fertile . Reason : Plants having even number of sets of chromosomes are sterile.

    The point of attachment of microtubules on the chromosomes is called as

    Read the assertion and reason carefully to mark the correct option in question. Assertion: Every chromosome essentially has a kinetochore on the sides of which centromeres are present. Reason: Based on the position of centromere or primary constriction chromosomes can be classified into five types.

    Assertion :- During meiosis-I there is no division of chromosome. Reason:- During meiosis-I there is separation and movement of homologous, in order to reduce thenumber of chromosome half in daughter cells.

    Assertion: "Touch" responses in Mimosa is an example of such movement. Reason : Nastic movements occur in the direction of stimulus.

    Home
    Profile