Multiplicative vs. arbitrary gene action in heterosis
Article Abstract:
The role of multiplicative gene action in producing heterosis was elucidated. Multiplicative effects between non-alleles give rise to epistatic effects of the additive by additive type. Heterosis may be partitioned into a dominance effect component and an additive by additive-epistasis component. Heterosis with multiplicative actions involve both the dominance components as well as the multiplicative interactions. However, heterosis without dominance may also arise from multiplicative as wellas other nonadditive effects between loci. Multiplicative action may make increase dominance effects. Further discussions on the genetic role of multiplicative effects are discussed.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1992
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Interval mapping of viability loci causing heterosis in Arabidopsis
Article Abstract:
The viability loci contributing to heterosis in Arabidopsis has been mapped, and it was detected that the possibility of heterosis is better explained by functional overdominance than by pseudo-overdominance. In the chromosomal I region where an overdominant factor has large effects on the viability mapped for a short time, the homozygotes had 50 percent lower viability than the heterozygotes. To examine chromosomal regions showing segregation distortion or viability selection, a maximum likelihood interval mapping procedure has been developed.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1995
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Absence of strong heterosis for life span and other life history traits in Caenorhabditis elegans
Article Abstract:
Wild type strains of Caenorhabditis elegans were studied to determine if heterosis for life span occurs. Life history trait and survival data were analyzed using the Kruskal-Wallis test for survival. There were no maternal effects on life expectancy for both male and hermaphrodites. Heterosis was not detected for other life history traits in crosses between N2 and Berg BO individuals. The F1 progeny exhibited intermediate traits and patterns of fertility. Life expectancy in both male and hermaphrodites appeared to be genetically controlled.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1993
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