1. The cross betweenhirsutum crinkled (Type 9) andbarbadense crinkled gave inF 2 a series of crinkleds ranging from an extreme and exaggerated type of crinkled (super-crinkled) to a type phenotypically indistinguishable from normal (pseudo-normal). In later generations several new types of crinkled were extracted in homozygous form.
2. It is considered thatG. barbadense andG. hirsutum possess dissimilar modifier complexes, which in the interspecific cross are broken down, leading to the production of a varying series of genotypical backgrounds upon which the crinkled mutant manifests itself in a corresponding series of reactions, some favourably and others unfavourably.
3. The conversion of the crinkled mutant to pseudo-normal by genic recombination resulting from the interaction ofbarbadense andhirsutum modifiers favours Fisher’s view that recessives may ultimately become merged in the wild type by accumulating modifiers.
4. A new method for the production of duplicate genes is suggested.
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Collins, J. L. (1924). “Inheritance inCrepis capillaris (L.) Wallr. III. Nineteen morphological and three physiological characters.”Univ. Calif. Publ. agric. Sci. 2, 249.
Fisher, R. A. (1928). “The possible modification of the responses of the wild type to recurrent mutations.”Amer. Nat. 62, 115.
Harland, S. C. (1932). “The genetics of cotton. Part V. Reversal of dominance in the interspecific crossG. barbadense Linn. ×G. hirsutum Linn.”J. Genet. 25, 261.
(1933). “The genetics of cotton. Part IX. Further experiments on the inheritance of the crinkled dwarf mutant ofG. barbadense L. in interspecific crosses and their bearing on the Fisher theory of dominance.”28, 315.
Hutchinson, J. B. (1932). “The genetics of cotton. Part VII. ‘Crumpled.’ A new dominant in Asiatic cottons produced by complementary factors.” Ibid.25, 281–91.
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Harland, S.C. The genetics of cotton. Journ. of Genetics 31, 21 (1935). https://doi.org/10.1007/BF02982276
- Fertile Plant
- Interspecific Cross
- Asiatic Cotton
- Lager Generation
- Dissimilar Modifier