During the pachytene stage in crossing over, the exchange of genetic material occurs between

Two non-homologous chromosomes

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Two homologous chromosomes

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Sister chromatids of non-homologous chromosomes

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Non-sister chromatids of non-homologous chromosomes

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Solution

The correct option is B Two homologous chromosomes
Pachytene is the third stage of prophase 1 of meiosis.
During this stage, each chromosome pair separates into sister chromatids and crossing over of genes occurs.
Crossing over is also called synapsis and is is one of the final stages of genetic recombination.
It is the process of exchange of genetic materials or segments between non-sister chromatids of homologous chromosomes.
So, the correct answer is 'Two homologous chromosomes'.

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Similar questions

Q. Exchange of segments between non-sister chromatids of homologous chromosomes is

Question 4
During Anaphase - I of meiosis
(a) homologous chromosomes separate
(b) non-homologous autosomes separate
(c) sister chromatids separate
(d) non-sister chromatids separate

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

Q. Assertion: Mitosis is known as equational division and meiosis is known as reduction division.
Reason: During meiosis, the non-sister chromatids of homologous chromosomes cross-over and exchange genetic information. This step does not occur during mitosis.

Q. 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

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