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Assertion (A): Crossing over takes place...

Assertion (A): Crossing over takes place between two homologous chromosomes.
Reason (R ): Crossing over is the exchange of chromosomal fragments between homologous chromosomes.

A

Both A and R are true and R is the correct explanation for A.

B

Both A and R are true, but R is not the correct explanation for A.

C

A is true and R is false.

D

A is false and R is true.

Text Solution

Verified by Experts

Crossing over is the exchange of genetic material between two homologous chromosomes. This takes place in pachytene stage of prophase I in meiotic cell division. Assertion is true and supported by reason.
Hence, the correct option is (a).
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Knowledge Check

  • Homologous chromosomes are

    A
    morphologically & genetically different
    B
    morphologically different but genetically similar
    C
    genetically similar
    D
    chromosomes which pair during synapsis

  • The exchange of chromosomal parts between non-homologous chromosomes is known as

    A
    Translocation
    B
    Transcription
    C
    Transduction
    D
    Translation

  • Crossing over is the exchange of genetic material between:

    A
    Non-sister chromatids of the homologous chromosomes
    B
    Sister chromatids of the homologous chromosomes
    C
    Chromatids of non-homologous chromosome
    D
    The gene those are completely linked

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    What are homologous chromosomes?

    What is homologous chromosome?

    What is Homologous chromosome?

    What dou mean by 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.

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