Abstract
The data obtained by different researchers on growth habit in Triticeae species often appear contradictory. The reason for such discrepancies could be the differences in the methods of dividing F2 segregating populations into spring and winter forms. A common is for researchers to consider F2 plants that fail to form ears by some arbitrary date (or the time of heading of tester plants used as a control) - as “winter”. Analysis of the distribution of heading dates is ignored in such cases. This approach actually treats a quantitative trait as an alternative one, violating the principles of genetics. As a result, the conclusions made, even in simple cases (when diploid species are studied), may be misleading.
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