Symmetrical and Asymmetrical Post-reduction in Ascomycetes


THE analysis of asci has shown that a pair of allelomorphic genes may segregate at the first meiotic division (pre-reduction) or at the second (post-reduction). Post-reduction may be symmetrical, with two like genes adjacent in the middle of the ascus, or asymmetrical. The analysis of 77 asci of Neurospora sitophila by Whitehouse1, and 31 by Wilcox2, Dodge3 and Lindegren4 has given the six possible patterns of the sex genes in the following numbers:

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  1. 1

    Whitehouse, New Phytol., 41, 23 (1942).

  2. 2

    Wilcox, Mycologia, 20, 3 (1928).

  3. 3

    Dodge, Mycologia, 22, 9 (1930).

  4. 4

    Lindegren, Bull. Torrey Bot. Club, 59, 119 (1932).

  5. 5

    Zickler, Planta, 22, 573 (1934).

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