Q.

Bivalent or tetrad formation is a characteristic feature observed during 

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a

synaptonemal complex in zygotene stage 

b

chiasmata in zygotene stage

c

synaptonemal complex in pachytene stage 

d

chiasmata in diplotene stage  

answer is A.

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Detailed Solution

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Bivalent or tetrad formation is a characteristic feature observed in synaptonemal complex in zygotene stage.
(2) Bivalent or tetrad formation is not observed in chiasmata in diplotene stage.
(3) Bivalent or tetrad is clearly visible in the pachytene stage.
(4) Chiasmata is not formed during the zygotene stage.

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