Species And Varieties, Their Origin By Mutation; Lectures Delivered At the University of California
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But an absolute reversion could no more be reached in this direction than in the normal one. Any sowing without selection would be 352 Ever-sporting Varieties liable to reduce the strain to an average condi- tion.
The production of varietal and of atavistic leaves is dependent to a high degree on external conditions. It agrees with the gen- eral rule, that favorable circumstances strengthen the varietal peculiarities, while un- favorable conditions increase the number of the parts with the atav...istic attribute. These in- fluences may be seen to have their effect on the single individuals, as well as on the generations growing from their seed. I cannot cite here all the experimental material, but a single illustra- tive example may be given. I divided a strong individual into two parts, planted one in rich soil and the other in poor sand, and had both pollinated by bees with the pollen of some nor- mal individuals of my variety growing between them. The seeds of both were saved and sown separately, and the two lots of offspring culti- vated close to each other under the same ex- ternal conditions.
What to read after Species And Varieties, Their Origin By Mutation; Lectures Delivered At the University of California?
You can find similar books in the "Read Also" column, or choose other free books by Vries Hugo De to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
But an absolute reversion could no more be reached in this direction than in the normal one. Any sowing without selection would be 352 Ever-sporting Varieties liable to reduce the strain to an average condi- tion.
The production of varietal and of atavistic leaves is dependent to a high degree on external conditions. It agrees with the gen- eral rule, that favorable circumstances strengthen the varietal peculiarities, while un- favorable conditions increase the number of the parts with the atav...istic attribute. These in- fluences may be seen to have their effect on the single individuals, as well as on the generations growing from their seed. I cannot cite here all the experimental material, but a single illustra- tive example may be given. I divided a strong individual into two parts, planted one in rich soil and the other in poor sand, and had both pollinated by bees with the pollen of some nor- mal individuals of my variety growing between them. The seeds of both were saved and sown separately, and the two lots of offspring culti- vated close to each other under the same ex- ternal conditions.
What to read after Species And Varieties, Their Origin By Mutation; Lectures Delivered At the University of California?
You can find similar books in the "Read Also" column, or choose other free books by Vries Hugo De to read onlineMoreLess
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