The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from [DPMT 1993]
A) 2 : 2 : 2 : 2 arrangement of ascospores in Neurospora
B) 4 : 4 arrangement of ascospores in Neurospora
C) Studies of meiosis in maize
D) Studies on linkage maps of chromosomes in Drosophila
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Studies on linkage maps of chromosomes in drosophila
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