ISSN:
1432-0886
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Conclusions The amount of relational coiling of chromatids during the prophase of mitosis and the average number of chiasmata were determined in the largest chromosome of five species of locusts. The statistical analysis of the data obtained suggests that probably there is a correlation between the amount of relational coiling per unit of chromosome length and the number of chiasmata. A similar suggestion was put forward bySax (1936) andHusted (1938), which was based upon observations made in different plant species. Though the difficulties encountered during the present cytological analysis of the chromosome structures, as well as the small number of species investigated, do not allow us to draw a definite conclusion, nevertheless it seems probable from our data that a greater degree of relational coiling of chromatids during mitosis is accompanied by a higher chiasma frequency during meiosis. The correlation furthermore indicates also that the physical basis of the tendency of chromatids, and that of paired chromosomes, to twist round one another relationally may be the same.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01271630
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