# Q.13. If there are 30 chromosomes in ${G}_{1}$-phase, then what will be number of bivalents in zygotene stage? (1) 30 (2) 15 (3) 45 (4) 60

Dear student,
Answer is 2) 15.
There are 30 chromosomes in G1 phase, replication will occur in S phase which will double the content of DNA but the number of chromosome will remain same. Bivalent is formed in the zygotene stage of prophase where homologous chromosome pair to form bivalent. Therefore 15 bivalents will be formed, as the number of chromosome is 30.

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