P. T. Thomas
Articles written in Journal of Genetics
Volume 37 Issue 2 February 1939 pp 255-286
Volume 37 Issue 2 February 1939 pp 287-299
1. The diploid variety of pear “Fertility”, 2
2. The tetraploid form was found to be more self-fertile than the type.
3. Pollen formation was that expected in a non-hybrid tetraploid.
4. The results obtained from using the diploid form of “Fertility” as female in crosses with triploids indicate that in certain crosses apomixis and/or gametic selection occurs.
5. The diploid form is shown to be somatically unstable, though meiosis proceeds normally.
6. The value of tetraploidy in producing new polyploid forms of pears is briefly discussed.
Volume 40 Issue 1-2 May 1940 pp 119-128
1. Apomictic modes of reproduction were detected in
2. Apospory, i.e. development from a purely vegetative embryo-sac, is the general method of non-sexual reproduction in the species examined.
3. Exceptional behaviour may occur within the sexual embryo-sac, such as (
4. These abnormalities will account for the segregation of characters among asexual progeny which has been observed by Mr Crane (pp. 113, 114).
5. Comparison of the developmental processes with genetical behaviour in six polyploid species of
6. The condition determining apomixis in
Volume 40 Issue 1-2 May 1940 pp 141-156
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