L. La Cour
Articles written in Journal of Genetics
Volume 30 Issue 3 May 1935 pp 415-422
1. Several species of Acrididae provide valuable material for both cytological and genetical research.
2. The technique of breeding and the life history of
3. The action of 14 genes in
4. The problems of genecology of grasshoppers are discussed and some preliminary results given.
Volume 33 Issue 2 October 1936 pp 237-254
1. The basic haploid chromosome number in the genus
2. Although the diploid species probably reproduce sexually in the wild, the polyploids must be purely clonal since no aneuploids have been found.
3. Two main types of change have affected the chromosome morphology of the genus. Genotypic change of size and regulated structural change altering the position of the centromere have separated the genus into three groups with large, medium and small chromosomes. Random structural change has produced complements with reduplicated fragments (
4. Evidence from external and chromosome morphology, from intersterility and from the time at which meiosis occurs, points to the conclusion that the subgroup
Volume 40 Issue 1-2 May 1940 pp 185-213
Volume 41 Issue 1 October 1940 pp 49-64
1. The frequency of chiasmata and of univalents is similar in pollen and embryo sac mother cells of
2. Cells with fewest chiasmata have those chiasmata most strongly localized either proximally or distally.
3. Hence pairing must have begun either near the centromere or near an end. The contact point is optional.
6. Samples of cells used for the study of meiosis in species and crosses must therefore be regarded as representing cross-sections of the process of pairing secured by a variable interruption of the process. Statistical treatment can be used to indicate the order of pairing and the means of interruption.
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