Inheritance of siliqua strength in Brassica campestris L. II. Quantitative genetic analysis

1986 ◽  
Vol 28 (4) ◽  
pp. 563-567 ◽  
Author(s):  
G. P. Kadkol ◽  
G. M. Halloran ◽  
R. H. Macmillan
Keyword(s):  
North Carolina ◽  
Genetic Analysis ◽  
Genetic Variance ◽  
Brassica Campestris ◽  
The North ◽  
Quantitative Genetic ◽  
High Heritability ◽  
Quantitative Genetic Analysis ◽  
Siliqua Strength ◽  
High Degree

Quantitative genetic analysis of siliqua strength in Brassica campestris L. was conducted in the cross cv. Torch × DS-17-D using the North Carolina experiment II design. This revealed the presence of a high degree of nonadditive genetic variance and a high heritability (broad sense) for all measures of siliqua strength. These results are in accordance with earlier findings of the likelihood of a small number of genes controlling siliqua strength which interact epistatically.Key words: siliqua strength, shatter resistance, genetic variances (additive and nonadditive), heritability.

A quantitative genetic analysis of an aposematic colour pattern and its ecological implications

1995 ◽  
Vol 348 (1326) ◽  
pp. 373-379 ◽  
Keyword(s):  
Genetic Analysis ◽  
Spot Size ◽  
Colour Pattern ◽  
Linked Gene ◽  
Quantitative Genetic ◽  
Ecological Implications ◽  
High Heritability ◽  
Quantitative Genetic Analysis ◽  
Colour Patterns ◽  
Genetic Covariances

The phenotypic and genetic variability of the aposematic colour pattern of the two-spot ladybird was investigated. There was significant variation in spot size (relative to elytron length) among wild populations of ladybirds. A quantitative genetic analysis revealed high heritability estimates for a number of individual colour pattern elements on the pronotum and elytra. The genetic covariances between the elytral spot and the pronotal spots were generally negative and all of the covariances among the pronotal spots were positive. This pattern of covariances could be explained if natural selection acts so as to maximize the combined anti-predator effect of the pronotal and elytral colour patterns by optimizing the rate of melanin production. An optimization process could also account for the significant levels of additive genetic variation found for each of the pattern elements considered. There was no evidence of any sex-linked gene expression for colour pattern, although female colour pattern may be influenced by maternally inherited factors.

scholarly journals A Quantitative Genetic Analysis of Nuclear-Cytoplasmic Male Sterility in Structured Populations of Silene vulgaris

Genetics ◽  
2001 ◽  
Vol 158 (2) ◽  
pp. 833-841 ◽  
Author(s):  
Douglas R Taylor ◽  
Matthew S Olson ◽  
David E McCauley
Keyword(s):  
Population Structure ◽  
Sex Ratio ◽  
Genetic Analysis ◽  
Cytoplasmic Male Sterility ◽  
Male Sterility ◽  
Sex Expression ◽  
Silene Vulgaris ◽  
Population Variance ◽  
Quantitative Genetic ◽  
Quantitative Genetic Analysis

Abstract Gynodioecy, the coexistence of functionally female and hermaphroditic morphs within plant populations, often has a complicated genetic basis involving several cytoplasmic male-sterility factors and nuclear restorers. This complexity has made it difficult to study the genetics and evolution of gynodioecy in natural populations. We use a quantitative genetic analysis of crosses within and among populations of Silene vulgaris to partition genetic variance for sex expression into nuclear and cytoplasmic components. We also use mitochondrial markers to determine whether cytoplasmic effects on sex expression can be traced to mitochondrial variance. Cytoplasmic variation and epistatic interactions between nuclear and cytoplasmic loci accounted for a significant portion of the variation in sex expression among the crosses. Source population also accounted for a significant portion of the sex ratio variation. Crosses among populations greatly enhanced the dam (cytoplasmic) effect, indicating that most among-population variance was at cytoplasmic loci. This is supported by the large among-population variance in the frequency of mitochondrial haplotypes, which also accounted for a significant portion of the sex ratio variance in our data. We discuss the similarities between the population structure we observed at loci that influence sex expression and previous work on putatively neutral loci, as well as the implications this has for what mechanisms may create and maintain population structure at loci that are influenced by natural selection.

scholarly journals Quantitative Genetic Analysis of Glucose Transporter 4 mRNA Levels in Baboon Adipose**

2004 ◽  
Vol 12 (10) ◽  
pp. 1652-1657 ◽  
Author(s):  
M. Elizabeth Tejero ◽  
J. Michael Proffitt ◽  
Shelley A. Cole ◽  
Jeanne H. Freeland-Graves ◽  
Guowen Cai ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Glucose Transporter ◽  
Mrna Levels ◽  
Glucose Transporter 4 ◽  
Quantitative Genetic ◽  
Quantitative Genetic Analysis

scholarly journals Quantitative genetic analysis of the bTB diagnostic single intradermal comparative cervical test (SICCT)

2016 ◽  
Vol 48 (1) ◽  
Author(s):  
Smaragda Tsairidou ◽  
Susan Brotherstone ◽  
Mike Coffey ◽  
Stephen C. Bishop ◽  
John A. Woolliams
Keyword(s):  
Genetic Analysis ◽  
Quantitative Genetic ◽  
Quantitative Genetic Analysis
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