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Assertion: During zygotene, chromosmes show bivalent stage.
Reason: Bivalent is half the number of chromosomes
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reson is false.
D. If both assertion and reason are false.

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Correct Answer - B
During zygotene, becaue of the pairing of the homologues, the nucleus contains half the number of chromosomes. Each unit is bivalent composed of two homologous chromosomes.

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