Results 221 to 230 of about 259,248 (266)

Genetic controls over melanocyte differentiation: Interaction of agouti‐locus and albino‐locus genetic defects

Journal of Experimental Zoology, 1987
AbstractTyrosinase activities and dopachrome conversion activity were evaluated in extracts made from skins of 6‐day‐old mice that were mutant at the agouti and albino loci. Dopa oxidase (DO) activity of tyrosinase in fully pigmented (C/C) mice is reduced in extracts made from skins of yellow 6‐day‐old mice as compared to those of black mice ...
M L, Lamoreux, P, Pendergast
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Genetic linkage analysis places locus DXS250 between locus DXYS1 and locus DXS3 in Xq21.3

Cytogenetic and Genome Research, 1992
The locus DXS250, which is linked to the Allan-Herndon type of X-linked mental retardation, maps between DXS3 and DXYS1 in a panel of 40 families established by the Centre d’Etude du Polymorphisme Humain, Paris.
S, Epting, C, Schwartz
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Genetical feedback repression I. Single locus models

Journal of Theoretical Biology, 1974
Abstract The process of genetical feedback-repression analogous to the Jacob-Monod system has been simulated by digital computer modelling, allowing inclusion of stochastic variation of the components. In the absence of stochastic variability, the model shows a damped oscillation over a wide range of specifications.
J, Tiwari, A, Fraser, R, Beckman
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Human protoporphyria: genetic heterogeneity at the ferrochelatase locus

Photodermatology, Photoimmunology & Photomedicine, 1995
Inherited deficiency of ferrochelatase results in erythropoietic protoporphyria (EPP). Genetic heterogeneity at the locus for human ferrochelatase was investigated. Analysis of genomic DNA of patients with EPP and of control subjects by restriction endonuclease techniques using ten different enzymes detected polymorphisms only at sites recognized by ...
L T, Ostasiewicz, J L, Huang, X, Wang, S, Piomelli, M B, Poh-Fitzpatrick   +4 more
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Genetics of Minute Locus in Drosophila Melanogaster

1980
Minutes are a class of dominant mutants that are characterized by their recessive lethality, increased developmental time, smaller body with short fine bristles in the heterozygotes and with varying degrees of reduced survival and fertility (Lindsley et al., 1972).
A K, Duttagupta, D L, Shellenbarger
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Genetic mapping of a second myotonic dystrophy locus

Nature Genetics, 1998
We report the mapping of a second myotonic dystrophy locus, myotonic dystrophy type 2 (DM2). Myotonic dystrophy (DM) is a multi-system disease and the most common form of muscular dystrophy in adults. In 1992, DM was shown to be caused by an expanded CTG repeat in the 3' untranslated region of the dystrophia myotonica-protein kinase gene (DMPK) on ...
L P, Ranum, P F, Rasmussen, K A, Benzow, M D, Koob, J W, Day   +4 more
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Sam Karlin and multi-locus population genetics

Theoretical Population Biology, 2009
Between 1967 and 1982, Sam Karlin made fundamental contributions to many areas of deterministic population genetic theory. This remembrance focuses on his work in multi-locus population genetics, primarily on the interaction between genotypic selection and the rate of recombination.
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Genetic characterization of the polycotyledon locus in tomato

Theoretical and Applied Genetics, 2006
Developmental mutants serve as a useful material to unravel the mechanisms necessary for organ development. The polycotyledon (poc) mutant of tomato, with multiple cotyledons in the seedling and varied phenotypic effects in the adult plant is one such mutant.
Kavitha, Madishetty, P, Bauer, M S, Sharada, A S A, Al-Hammadi, R, Sharma   +4 more
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Worldwide genetic diversity at the HLA-DQA1 locus

American Journal of Human Biology, 1997
Genotype, gene, or phenotype frequency data, obtained by PCR analysis with sequence specific oligonucleotide probes at the HLA-DQA1 locus, in 176 population samples, each consisting of 30 or more individuals, from all around the world were analyzed. The sampled populations were assigned to the following nine groups: African, Afro-American, American ...
F, Rivas, Y, Zhong, N, Olivares, R M, Cerda-Flores, R, Chakraborty   +4 more
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Simplifying genetic locus assignment of HLA-DRB genes

Immunology Today, 1994
The DR haplotypes of the human major histocompatibility complex have been arranged in five haplotypic groups based on genomic cloning and sequence analyses. To date, the expressed DRB sequences have been assigned to four different loci: DRB1, 3, 4 and 5.
G, Andersson, L, Andersson, D, Larhammar, L, Rask, S, Sigurdardóttir   +4 more
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