Question

how many bivalents are seen in zygotene when somatic/diploid cell has 20 chromosomes​

Answer 1

Answer:

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When the zygotene stage begins, the homologous chromosomes pair up to for bivalents or tetrads. 

If there are 60 chromosomes in G1 phase, then after S phase, there would be 120 chromosomes. 

And we know that each bivalent is formed of 4 chromosomes so there will be 120%4=30bivalents in zygotene stage. 

Hence, 30 number of bivalents in zygotene stage, if there are 60 chromosomes in G1 phase.

So, the correct answer is '30'.