Articles written in Journal of Genetics
Volume 28 Issue 3 March 1934 pp 407-424
1. Of two interspecific hybrids between Asiatic and New World cottons studied, one had 2
2. In a study of the somatic chromosomes of New World cotton it has been found that half of the chromosomes are small and the other half larger, the latter being comparable in size to the chromosomes of Asiatic cotton. The small chromosomes of New World cotton are of the same size as those in diploid wild species from North America. Species from the Old World and from Australia are all characterised by the larger size of their chromosomes.
3. In the first meiotic division it was seen that (1) at least 13 univalent chromosomes are present in both hybrids, and (2) the hybrid with 52 chromosomes shows the same chromosome conjugation as in a triploid Asiatic cotton, but with the addition of an extra set of 13 non-homologous chromosomes.
4. The conclusion was drawn that New World cottons are allopolyploid species. It is thought that these probably originated from a cross between two species of
Volume 30 Issue 3 May 1935 pp 397-405
2. The chromosome pairing in the hybrid is incomplete, but allosyndesis takes place about nine times more often than autosyndesis. Univalents are just as frequent between the small chromosomes from
3. The chiasma frequency is the same in the pure species despite the difference in chromosome size. Contrasted with the pure species, the chiasma frequency in the hybrid is significantly smaller in the bivalents containing a
4. The difference in the size of the chromosomes of the species under observation is in all probability neither the result of genetic factors, nor associated with a difference in pairing blocks.
Volume 31 Issue 2 August 1935 pp 263-296
1. In the present study the chromosome numbers of about 120 species representing 25 genera of the family Malvaceae have been described. The following chromosome numbers were found: 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 25, 26, 28, 33, 35, 36, 38, 39, 42, 46, 56 and 65.
2. Evidence has been presented in favour of the following chromosome series: (
3. In most genera, all species examined are members of the same chromosome series (
Volume 34 Issue 1 February 1937 pp 97-134
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