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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

Zygotene

B

Pachytene

C

Diplotene

D

Diakinesis

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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?

CENGAGE BIOLOGY ENGLISH-CELL CYCLE AND CELL DIVISION-ARCHIVES (Chose the corrct option):
  1. [A] : Crossing over takes place during pachytene stage . [R] : It is...

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  2. Given below is a schematic break-up of the phases/stages of cell cycle...

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  3. Synapsis occurs between:

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  4. Which stages of cell division do the following figures A and B represe...

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  5. During mitosis ER and nucleolus begin to disappear at

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  6. Select the correct option with respect to mitosis

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  7. During gamete formation, the enzyme recombinase participates during

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  8. Given below is the representation of a certain event at a particular s...

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  9. The complex formed by a pair of synapsed homologous chromosomes is cal...

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  10. The enzyme recombinase is required at which stage of meiosis

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  11. In 'S' phase of the cell cycle

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  12. During which phase(s) of cell cycle, amount of DNA in a cell remains a...

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  13. A somatic cell that has just completed the S-phase of its cell cycle, ...

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  14. Select the correct option {:(," Column-I",," Column-II"),(,"a. ...

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  15. Arrange the following events of meiosis in correct sequence : (a) Cr...

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  16. Spindle fibres attach on to

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  17. In meiosis crossing over is initiated at

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  18. Which of the following is not a characteristic feature during mitosis ...

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  19. A cell at telophase stage is observed by a student in a plant brought ...

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  20. During cell growth, DNA synthesis takes place in

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  21. When cells have stalled DNA replication fork, which checkpoint should ...

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