Practice question
Question
Ordered tetrads are characteristic of
Explanation
Ordered tetrads retain linear arrangement directly reflecting chromatid segregation order during meiosis I and II divisions plus postmeiotic mitosis. Bread mold Neurospora crassa produces cylindrical asci barely wider than individual spores, forcing spores into single file after meiosis followed by one mitosis. Spore position along ascus correlates with chromatid position at metaphase plates, permitting clear distinction between first division segregation where alleles separate at meiosis I displaying 4:4 pattern and second division segregation indicating gene-centromere crossover occurred. Such linear order invaluable for centromere distance measurements and interference studies experimentally.
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