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- W2003085387 abstract "At the meiotic prophase of the PMCs in Rhoeo discolor Hance, twelve chromosomes conjugate end-to-end forming a ring, a chain or several chains, a condition which was attributed by Sax (1931) and others to the segmental interchange between non-homologous chromosomes. Non-disjunction of meiotic chromosomes has been observed by several authors to occur with tolerable frequencies. The present author has studied non-disjunction of meiotic chromosomes in connection with the pollen fertility. The observation on 100 metaphase plates which were obtained from acetocarmine preparations showed the following facts.1) Non-disjunction of adjacent chromosomes in a ring or a chain occurs in about one-third of the pollen mother cells observed (Table 1).2) The occurrence of such non-disjunction is restricted to relatively long chains (Table 2).3) Non-disjunction of adjacent kinetochores connected by two short arms occurs more than seven times as frequently as those by long arms (Table 3 and Text-figs. 1-4).4) Another case of non-disjunction takes place in cases of more than two chains, suggesting that each chain constitutes a system independent of one another regarding chromosome movement (Text-figs. 4-6).5) Pollen grains which received at least one complete genome are capable of the further nuclear divisions, but those containing less than one genome degenerate soon after the tetrad formation (Text-figs. 7 and 8).The expectation for the pollen fertility calculated from the present data (Table 4) is approximately close to the actual pollen fertility examined in acetocarmine preparations (Table 5).Disjunction and non-disjunction of adjacent kinetochores in a ring or a chain must depend upon the behavior of polar granules at diakinesis and metaphase. The investigation on these matters is now in progress." @default.
- W2003085387 created "2016-06-24" @default.
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- W2003085387 date "1937-01-01" @default.
- W2003085387 modified "2023-09-25" @default.
- W2003085387 title "Non-Disjunction of the Meiotic Chromosomes in <i>Rhoeo discolor</i> Hance" @default.
- W2003085387 doi "https://doi.org/10.1266/jjg.13.31" @default.
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