منابع مشابه
A Consideration of Variegation.
The segregation of albino or chlorophyll deficient seedlings in a pedigree propagated by self-fertilization is due either to a definite genetic factor or factors according to DEMEREC (1923) in maize, HALLQVIST (1926) in barley, etc., or to the abnormality of the plastids themselves according to CORRENS (1909) in Mirabilis, BAUR (1909) in Pelargonium, ANDERSON (1923) in maize, CLAUSEN (1927) in ...
متن کاملSingle-locus modification of position-effect variegation in Drosophila melanogaster. I. White variegation.
mechanism of position-eff ect variegation has been and remains a fasciT?ating puzzle, tan talizing the student of the genetics of somewhat higher organisms with the hope that here is a clue to the riddle of the sequential shifts of control during development. This view is elaborated in BAKER’S (1963) able review of his own and his colleagues’ work. One of the more refractory aspects of the puzz...
متن کاملAdiantum capillus-veneris Linn. (Maidenhair fern) in modern phytotherapy
Background and objectives: Maidenhair fern is an herbal medicine belonging to the family Pteridaceae which is extensively found in Atlantic coast as far as Ireland, America and Iran. The fronds of Adiantum capillus-veneris are prescribed for treatment of different diseases. Different phytochemical compositions such as flavonoids, alkaloids, tannins, terpenoids, etc...
متن کاملVariegation Initiated by a Dominant Allele in the Tomato.
HE locus of Woolly is in chromosome 2 of the tomato, Lycopersicon escuZentum, in which the basic chromosome number is 12. Three alleles, in addition to the normal non-Woolly allele, WO+, are known. WO and Wov are dominant and lethal when homozygous, and WO"' is partially dominant and viable when homozygous (RICK and BUTLER 1956). Woolly plants have thicker, longer trichomes than the normal and ...
متن کاملAMERICAN FERN JOURNAL QUARTERLY JOURNAL OF THE AMERICAN FERN SOCIETY Revealing a Cryptic Fern Distribution Through DNA Sequencing: Pityrogramma trifoliata in the Western Andes of Peru
—Fern identification usually requires the use of mature sporophytes, since attempts to identify juveniles using morphological traits often provides unsatisfactory results. Here we examined young sporophytes found among boulders in a river basin of a xeric valley in central Peru. Attempts to identify these sporophytes first pointed to four different genera, two in Pteridaceae (Anogramma and Pity...
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ژورنال
عنوان ژورنال: Nature
سال: 1921
ISSN: 0028-0836,1476-4687
DOI: 10.1038/107233b0