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The evidence that crossing over occurs a...

The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from

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

Studiess on linkage maps of chromosomes in Drosophila

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The correct Answer is:
A
(a) In Neurospora it produces 4 types of ascopores two of one parental type, two of other parental type, two of one recombinant and another two of second recombinant type.
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