P. Ch. Koller
Articles written in Journal of Genetics
Volume 26 Issue 1 July 1932 pp 81-96
arrest of terminalisation of chiasmata
pairing of unequal chromosomes
torsion of chromatids
morphological change in chromosome
pairing of fragments, discussed in relation to the chiasma theory of metaphase pairing.
The observations show that both species obey the general principles of meiosis as recently outlined by Darlington.
Volume 26 Issue 2 October 1932 pp 215-229
The behaviour of two modifiers in
It is suggested that
A tentative suggestion is put forward to explain the autosomal position of Beaded as compared with the sex-linked nature of
Volume 26 Issue 3 December 1932 pp 359-383
Volume 29 Issue 2 July 1934 pp 159-173
1. The determination of the relationship of crossing-over to chiasmata and of chiasmata to segregation has made it possible to define the conditions of variation of pairing chromosomes in complex-heterozygotes and sex-heterozygotes and to analyse their behaviour in genetic terms. The object of the present studies is, first, to test the predictions made with regard to sex-chromosomes deducing their genetic structure from cytological observations and, secondly, to note those respects in which the behaviour of the sex-chromosomes throws light on the problems of chromosome mechanics.
2. The sex-chromosomes of the Norway rat each consist of a pairing segment and a differential non-pairing segment. The pairing segment includes the spindle attachment and chiasmata may be formed on one or both sides of it so that the first division is either reductional or equational for the differential segments (Text-fig. 17).
3. The differential segments will have complete sex-linkage, the pairing segments will have partial sex-linkage diminishing in proportion to the crossing-over distance from the differential segments.
4. The shape, movements, and staining capacity of the sex-chromosomes in the rat and elsewhere agree in suggesting that they have a lower surface charge than the autosomes, and this is held to be responsible for the special mechanism of
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