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Out of 8 ascospores formed in Neurospora the arrangement is 2a : 4a : 2a showing

1. No crossing over
2. Some meiosis
3. Second generation division
4. First generation division

Correct answer: Second generation division

Solution

A 2a:4a:2a arrangement in Neurospora is a classic second-division segregation pattern. It happens when crossing over occurs between the gene and the centromere, so alleles separate at meiosis II rather than meiosis I.

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