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The Genetics of Wheat Species


RECENT years have witnessed important advances in our knowledge of the wheats, which are now recognised to fall into three well-marked groups, differing in their chromosome numbers and rust resistance, and showing inter-sterility when members of different groups are crossed. Much genetical work has been devoted, not only to crosses between hexaploid and tetraploid or tetraploid and diploid species, but also to crosses between species having the same chromosome numbers. In the latter series of crosses, in which there is relatively full fertility, various investigators, including Tscbermak, Nilsson-Ehle, Engeldow, Percival, Kajanus, and Malinowski, have taken part. The results of these crosses between wheat species having the same chromosome numbers have been much simpler than might have been anticipated, and they raise some interesting questions concerning the relationships between these species, the nature of the differences involved, and the manner in which these differences are germinally represented.

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