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[A] : Crossing over takes place during p...

[A] : Crossing over takes place during pachytene stage .
[R] : It is a process of inter change of chromatin material between one sister chromatid of each homologous 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.

Text Solution

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The correct Answer is:
B
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Crossing over is the exchange of genetic material between ______chromatids of homologous chromosomes.

Assertion (A). Events in pachytene play a key role in evolutionary changes in organisms Reason (R) .Exchange of genetic material takes place between sister chromatids of homologous chromosomes

Assertion: Crossing over leads to recombination of genetic material on the two chromosomes. Reason: Crossing over is the exchange of genetic material between two homologous chromosomes.

A : Crossing over is exchange of genetic material between non-homologous chromosomes. R : it produces new linkages.

The exchange of genetic material between chromatids of paired homologous chromosomes during first meiotic division is called

Crossing over takes place between : (a) Two sister chromatids (b) Two non-sister chromatids (c) Three homologous chromosomes (d) Four non-homologous chromosomes

Crossing over takes place between which chromatids and in which stage of the cell cycle ?

Which of the following events takes place during anaphase stage of mitosis I. Spindle fibres attach to kinetochores of chromosomes II. Centromeres split and chromatids separate III. Chromatids move to opposite poles IV. Nucleolous, Golgi complex and E.R. reform

Name the stage of cell cycle at which one of the following events occur Crossing over between homologous chromosomes takes place

Read the following statements. (a) During crossing over, exchange of genetic material between sister chromatids occurs. (b) By the end of diakinesis, nucleolus reappears. (c) During the stage between telophase 1 and prophase II, chromosomes get elongated. Which of the given statements is/are correct?

ALLEN-CELL BIOLOGY (CELL STRUCTURE, FUNCTION & CELL DIVISION)-EXERCISE-IV (Directions for Assertion & Reason questions)
  1. Assertion :- Cells in quiscent stage (G(0)) are metabolically inactive...

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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 :- K...

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

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

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

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

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

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

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  11. Assertion :- In higher plants, the mitosis is termed as anastral mitos...

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  12. Assertion : Replication of DNA not occurs during interkinesis. Reaso...

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  13. Assertion : Meiosis is also known as reduction division. Reason : Me...

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  14. Assertion : Meiosis produces four genetically dissimilar cells. Reas...

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  15. [A] : Crossing over takes place during pachytene stage . [R] : It is...

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  16. Assertion :- Yeast can progress through the cell cycle in only about 9...

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  17. Assertion :- During S-phase, amount of DNA per cell doubles. Reason ...

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  18. Assertion :- M-phase is the most dramatic period of the cell cycle. ...

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  19. Assertion : Small cells are metabolically less active Reason : K.I. ...

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