منابع مشابه
Genetic control of flower shape in Antirrhinum majus.
The asymmetric shape of the Antirrhinum corolla is determined by genes acting differentially along the dorsoventral axis of the flower. Genes so far identified determine asymmetry by acting in dorsal regions. We describe a gene, divaricata, which in contrast to previously identified genes acts in ventral regions of the flower. We show by the analysis of mutant combinations that the divaricata g...
متن کاملCurt Stern on Somatic Crossing Over.
In the mid-1930s, Curt Stern was investigating why certain Drosophila mutants develop mosaic patches with different body bristle phenotypes, when he noticed a recurring pattern. In one particular cross, the offspring sometimes carried areas with one recessive phenotype (yellowish-brownish bristles) immediately adjacent to a sector showing a second recessive phenotype (gnarled bristles, known as...
متن کاملMolecular cytogenetic characterization of the Antirrhinum majus genome.
As a model system in classical plant genetics, the genus Antirrhinum has been well studied, especially in gametophytic self-incompatibility, flower development biology, and transposon-induced mutation. In contrast to the advances in genetic and molecular studies, little is known about Antirrhinum cytogenetics. In this study, we isolated two tandem repetitive sequences, CentA1 and CentA2, from t...
متن کاملChemotropic Response of the Pollen of Antirrhinum majus to Calcium.
An improved spectrophotometric method for the determination of lipoxidase activity was developed and applied in studies of the purified enzyme and crude enzyme preparations from leguminous seeds, with linoleic acid solubilized in Tween 20 as the substrate. The optimum pH was found to be 7.0, 6.5, 6.0, and 5.5, for purified soybean lipoxidase and for the crude lipoxidases extracted from gram flo...
متن کاملSomatic Crossing over in Relationship to Heterochromatin in Drosophila Melanogaster.
OMATIC crossing over, was first demonstrated by STERN (1936) in Drosophila srneZarzogaster, and has since been shown to occur in fungi. From the observation of single and twin mosaic spots in the hypoderm, STERN concluded that the exchanges occur at the four-strand stage, and that the chromatids segregate equationally proximal to the point of exchange and reductionally distal to the point of ex...
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ژورنال
عنوان ژورنال: Heredity
سال: 1977
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1977.22