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Genetics. May 1989; 122(1): 211–222.
PMCID: PMC1203686

The Genetic Architecture of Interspecific Variation in Mimulus

Abstract

The genetic architecture of various floral and morphological differences between Mimulus cupriphilus and Mimulus guttatus is investigated. M. cupriphilus is believed to have speciated from M. guttatus in the recent past. The two parent species, the F(1) and F(2), and two backcrosses were grown and scored for 23 different characters. The analysis of means revealed significant epistasis for a number of the floral characters, particularly those involving the length of parts. Dominance was generally toward M. guttatus, except for the characters related to flowering time. Analysis of the genetic correlations between characters revealed that there were at least four different polygenic genetic systems, governing flowering time, size of flower, number of spots on the corolla, and general size. An analysis of minimum gene number suggested that there were at least 3-7 genes controlling floral size, and a different three controlling floral spot number. Two other characters, corolla lobe shape and stem color, were produced by independent major gene differences. Annuality was also shown to be heritable. The two species appear to utilize the same gene for copper tolerance. The results are discussed in the light of current theories of speciation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Lande R. The minimum number of genes contributing to quantitative variation between and within populations. Genetics. 1981 Nov-Dec;99(3-4):541–553. [PMC free article] [PubMed]
  • Templeton AR. The theory of speciation via the founder principle. Genetics. 1980 Apr;94(4):1011–1038. [PMC free article] [PubMed]

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