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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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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.