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a
Diakinesis - disappearance of nuclear envelope
b
Anaphase I - separation of sister chromatids
c
Zygotene - formation of synaptonemal complex
d
Diplotene - visibility of chiasmata
answer is B.
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Detailed Solution
Sister chromatids of chromosomes are separated during Anaphase II but not in Anaphase I. In Anaphase I, there is segregation of homologous chromosomes of bivalents.