The Germ Plasm a Theory of Heredity
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Cases 270 THE GERM-PLASM.
are, however, also known in which these fluctuations are so considerable as to become conspicuous. Sometimes, for instance, the hybrid resembles one species as regards its leaves, and the other with regard to its blossoms. Brandza* has recently examined the general, as well as the microscopic structure of certain hybrids, in order to ascertain the parental characteristics exhibited by them, and has succeeded in proving that a fluctuation of this kind exists. Marrubium ...vaillantii, a cross between Leonurus cardiaca and Marrubium vulgare, for instance, exhibited the winged leaf-stalk characteristic of M. Vulgare, while the arrangement of the vascular bundles of the petiole resembled that existing in Leonurus. The upper surface of the petiole bore branched hairs like those of Leonurus, while on the lower surface the hairs resembled those of Marrubium.
I shall speak of this fluctuation in the resemblance of the organs to those of the parents as ' the shifting of the hereditary resultants in ontogeny} We might imagine, a priori, that such a shifting cannot possibly occur.
What to read after The Germ Plasm a Theory of Heredity?
You can find similar books in the "Read Also" column, or choose other free books by Weismann, August, 1834-1914 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Cases 270 THE GERM-PLASM.
are, however, also known in which these fluctuations are so considerable as to become conspicuous. Sometimes, for instance, the hybrid resembles one species as regards its leaves, and the other with regard to its blossoms. Brandza* has recently examined the general, as well as the microscopic structure of certain hybrids, in order to ascertain the parental characteristics exhibited by them, and has succeeded in proving that a fluctuation of this kind exists. Marrubium ...vaillantii, a cross between Leonurus cardiaca and Marrubium vulgare, for instance, exhibited the winged leaf-stalk characteristic of M. Vulgare, while the arrangement of the vascular bundles of the petiole resembled that existing in Leonurus. The upper surface of the petiole bore branched hairs like those of Leonurus, while on the lower surface the hairs resembled those of Marrubium.
I shall speak of this fluctuation in the resemblance of the organs to those of the parents as ' the shifting of the hereditary resultants in ontogeny} We might imagine, a priori, that such a shifting cannot possibly occur.
What to read after The Germ Plasm a Theory of Heredity?
You can find similar books in the "Read Also" column, or choose other free books by Weismann, August, 1834-1914 to read onlineMoreLess
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