Chromosome Studies on Trillium kamtschaticum Pall. and Its Allies
XVII. A study of chromosome interlocking in T. Tschonoskii Maxim
1944 Volume 13 Issue 3-4 Pages 369-379
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1944 Volume 13 Issue 3-4 Pages 369-379
The present paper deals with the analysis of interlocking of bivalents in PMCs of Trillium Tschonoskii. A total of 50 cases of single interlocking at MI were analyzed as to chromosome type. The result indicated that the frequency of interlocking is proportional to the length of the chromosome arm. This finding can be interpreted by reasoning that in the present material the bivalent constitution is of the K-type (see No. 10 of this series) and hence the arm, not directly the whole chromosome, is involved in the frequency of interlocking.
As to double interlocking, four cases were analyzable. In all of them, the central connection of the two successive loops of the bivalent at question was the paired kinetochores and not a real chiasma. Therefore one of the “evidences” favoring the chiasmatype theory of crossing-over has entirely lost its force.
