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Assertion :- Morphology of chromosomes i...

Assertion :- Morphology of chromosomes is most studied during metaphase of cell division.
Reason :- Complete disintegration of nuclear envelope marks the start of metaphase, second phase of mitosis.

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.

Text Solution

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The correct Answer is:
B
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Read the following statements (a) Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis. (b) Metaphase chromosome is made up of one sister chromatid

A : The complete disintegration of the nuclear envelope marks the start of metaphase. R : Chromosomes are distinct with two chromatids at this stage.

Read the following statement and choose the correct option spindle fibres get attached to the kinetochore of the chromosomes during metaphase. At the end of prophase cells do not show golgi complex, endoplasmic reticulum, nucleolus and the nuclear envelope. At anaphase centromere splits but chromatids do not separate.

Statement (s) Nondisjunction is the failure of paired chromosomes to segreagate during the metaphase of meiotic division of fametogenesis Reason (R ) Non disjunction results in production of abnormal gametes

Assertion.The spindle microtubles join the chromatids at the kinetochore in metaphase of mitosis Reason.poleward movement of the chromadits during anaphase begins at the kinetochores.

MOTION-CELL CYCLE AND CELL DIVISION-Exercise - 4(AIIMS - 2018)
  1. Assertion :- During M phase of karyokinesis of mitosis each chromosome...

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  2. Assertion :- Disappearance of nuclear membrane is generally essential ...

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  3. Assertion :- Morphology of chromosomes is most studied during metaphas...

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  4. Assertion :- Kinetochore is essential for cell division. Reason:- Ki...

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  5. Assertion :- In anaphase number of chromosomes get doubled. Reason:D...

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  6. Assertion :- In telophase chromosomes that have reached their respecti...

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  7. Assertion :- Telophase is also referred to as reverse prophase. Reas...

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  8. Assertion :- In plant cells cell plate method is found for cytokinesis...

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  9. Assertion :- Cell growth results into division Reason :- Cell growth...

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  10. Assertion :- Meiosis involves two sequential cycles of nuclear and cel...

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  11. Assertion :- Meiosis-l is most significant phenomenon from evolution p...

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  12. Assertion :- Zygotene is charactersed by formation of synaptonemal co...

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  13. Assertion :- During pachytene crossing over takes place which is depen...

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  14. Assertion :- Chiasmata is the result of crossing over. Reason:- Chia...

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  15. Assertion :- Telophase-I leads to formation of diad of cells. Reason...

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  16. Assertion :- Both meiosis-I and meiosis -II are always interrupted by ...

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  17. Assertion :- Each chromatid is attached with two spindle fibres during...

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  18. Assertion :- During meiosis-I there is no division of chromosome. Re...

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  19. Assertion :- Segregation of genes take place during anaphase-II Reas...

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  20. Assertion :- Colchicine is a mitotic poison. Reason:- Colchicine int...

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