The Categories of Variation
The Categories of Variation
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So far as our knowledge goes the situation is the same in respect to polydactylism in man.
The second volume of the Mutationstheorie, which seems to have been little read by most expositors of De Vries, affords several examples of irregular behavior of the hybrids between elementary species which are very difficult to classify. Crosses between (Enothera nanella and 0. Rubrinervis, for instance, the one *a retrograde variety of Lamarckiana and the other a distinct elemen- tary species, gave very... variable results, with splittings in the first and succeeding generations in very inconstant ratios, and the occasional production of blends which bred fairly true. We have here a curious combination of the characteristics of unisexual and bisexual crosses.
It would not be difficult to bring forward many other j cases which refuse to fall within the scheme of classifica- tion propounded by De Vries. There are many kinds of variations which are inherited in many kinds of ways. The pangen theory of the celebrated botanist has proved a deceptive guide and has led its author to do scant justice to many classes of facts which do not fall in line with it.
What to read after The Categories of Variation?
You can find similar books in the "Read Also" column, or choose other free books by Samuel J Samuel Jackson Holmes to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
So far as our knowledge goes the situation is the same in respect to polydactylism in man.
The second volume of the Mutationstheorie, which seems to have been little read by most expositors of De Vries, affords several examples of irregular behavior of the hybrids between elementary species which are very difficult to classify. Crosses between (Enothera nanella and 0. Rubrinervis, for instance, the one *a retrograde variety of Lamarckiana and the other a distinct elemen- tary species, gave very... variable results, with splittings in the first and succeeding generations in very inconstant ratios, and the occasional production of blends which bred fairly true. We have here a curious combination of the characteristics of unisexual and bisexual crosses.
It would not be difficult to bring forward many other j cases which refuse to fall within the scheme of classifica- tion propounded by De Vries. There are many kinds of variations which are inherited in many kinds of ways. The pangen theory of the celebrated botanist has proved a deceptive guide and has led its author to do scant justice to many classes of facts which do not fall in line with it.
What to read after The Categories of Variation?
You can find similar books in the "Read Also" column, or choose other free books by Samuel J Samuel Jackson Holmes to read onlineMoreLess
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