Assertion (A) : Pairing or synapsis of homologous chromosomes takes place during zygotene of prophase I
Reason (R) : Synaptonemal complex is present in between homologous pair of chromosomes in zygotene

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Both A and R are correct but R is not, a correct explanation of A

Both A & R are incorrect

A is correct, R is incorrect

Both A & R are correct. R is the correct explanation of A

answer is A.

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Detailed Solution

Zygotene stage is the second stage of prophase I of meiosis. It is next to Leptotene.

During this stage, chromosomes start pairing together and this process of association is called synapsis. Such paired chromosomes are called homologous chromosomes. Electron micrographs of this stage indicate that chromosome synapsis is accompanied by the formation of complex structure called the synaptonemal complex. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad.

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