Articles written in Journal of Genetics
Volume 3 Issue 2 September 1913 pp 105-106
Volume 5 Issue 1 July 1915 pp 13-36
Volume 5 Issue 3 March 1916 pp 159-182
Volume 6 Issue 4 July 1917 pp 317-339
Volume 13 Issue 1 March 1923 pp 125-131
Volume 15 Issue 2 March 1925 pp 233-235
Volume 25 Issue 1 November 1931 pp 25-54
Genetical and cytological studies on the relations between Asiatic and European varieties of
The fourteen chromosomes of normal races of
Direct observation of exchange of partners amongst the chromatids.
Alternate loops between points of contact are at right angles.
The frequency and distribution of these points agrees with that of demonstrable chiasmata in other organisms (
The method of separation of the pairs at anaphase, the ehromatids associated at the attachment constriction always passing to the same pole, leads to the separation of chromatids in the regions distal to the first point of contact. The regions distal to the second point of contact are either not separated or are asymmetrical, according to the relationship of the exchanges at the two points.
The nature of the associations of four, whether in a ring or a chain, is shown to depend upon the formation of chiasmata between the homologous segments. Its appearance is determined by the number and distribution of chiasmata present and by its orientation.
In about half the cases examined non-disjunction occurs in the ring, two adjacent chromosomes passing to each pole. It is suggested that this gives rise to non-viable gametes through genetic unbalance, brought about by chromosome segment deficiency and reduplication.
Volume 39 Issue 3 March 1940 pp 363-390
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