Summary
Multi-factor interations in Caligari and Mather's (1975) ANOVA for eight substitution lines of Drosophila melanogaster in nine invironments were examined by cluster analysis. The results indicate a concise explanation of both types of interchromosomal interactions—that which determines the average effect of genotype and that which determines the ordinary genotype-environment (GE) interaction—as follows. For chaeta number, when only one of the three major chromosomes (X, II, and III) of W-stock is substituted by S-stock, the phenotypic values do not change. However, if more than one chromosome is substituted, they change and differ among themselves. The same pattern holds for yield of offspring with respect to S-stock. The data were also investigated by a two-line analysis using an extension of Mather and Caligari's (1976) approach. The statistics for testing the hypothesis of no dependency of GE interaction between a pair of contrasting chromosome ( i. e., g values) against the background chromosome, which the pair has in common, are closely related to a component of ANOVA in the eight-line analysis. For those data the g values are shown not to be independent of the background chromosomes. An implication of these analyses is that genes which control average effect and those which control sensitivity to environmental change can be conditionally dependent on other genes of the same type within a chromosome.
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Lin, C., Williams, C. & Binns, M. Investigation of interchromosomal interactions among three major chromosomes of Drosophila melanogaster in response to environments and the relationship between multi-line and two-line analyses: Re-examination of caligari and mather data. Heredity 52, 403–414 (1984). https://doi.org/10.1038/hdy.1984.48
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DOI: https://doi.org/10.1038/hdy.1984.48