| Popis: |
Plant breeders are concerned with a wide range of traits in their crop plants. Some of these, such as incompatibility or certain types of disease resistance, may be controlled by just one or two genes whose effects are relatively large. Many, and possibly most traits, however, are complex, being under the control of a number of genes as well as being considerably influenced by the environment. Characters such as yield, quality and maturity date are typical examples. These characters generally show no clear discontinuity between genotypes, the range of appearance of one overlapping that of others so extensively as to give the impression of a continuous distribution. |
