A) single strand stage
B) two strand stage
C) four strand stage
D) eight strand stage
Correct Answer: C
Solution :
During pachytene substage or prophase-I or meiosis, the chromosomes are tetravalent, ie, contain 2 chromatids with 4 arms. Crossing over occurs during this substage, which involves the exchange of segments between the non-sister chromatid of homologues.
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