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Question

Find out the number of bivalents in zygotene stage, if there are 60 chromosomes in G1 phase.

A
60
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B
30
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C
15
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D
45
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Solution

The correct option is B 30
  • 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'.

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