âDepartment of Zoology, Duke University, Durham, North Carolina 27708 and +Departmentof Statistics, North Carolina State University, Raleigh, North Carolina 27695 Manuscript received September 7, 1995 Accepted for publication December 11, 1995 ABSTRACT Two closely related speciesof Drosophila,D. simukzns and D. mauritiana, differ markedly in morphology of the posterior lobe of the male genital arch. Both size and shape aspects of lobe variation can be quantified b a morphometric descriptor y based on elliptical Fourier and principal components analyses. The genetic architectureof this quantitative trait (PC1) was investigated by hybridizing inbred lines to produce two backcross populations -200 individuals each,which were analyzed jointlyy a composite of b interval mapping procedure with the aid of 18 marker loci. The parental lines show a large difference >80% in PC1 (30.4 environmental standard deviations), and the markers account for of the phenotypic of variation in backcross populations. Eight 15 intervals analyzed show convincing evidence of quantitative trait loci (QTL), and the range of estimated QTL effects is 5.7-15.9% of the parental difference (1.7-4.8 environmental standard deviations). These estimates may represent the joint effects of multiple QTL within a single interval (which averaged 23 cM in length). Although there is some evidence of
Genetics – Genetics Society of America
Published: Apr 1, 1996
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