Competition in drosophila iii. A possible maternal effect

SUMMARY The Wellington and Samarkand inbred lines differ in competitive ability when tested in competition with the 6CL stock. This difference was analysed using the eight true-breeding

lines which comprise all the possible combinations of chromosomes I, II and III, treated as units, from Wellington and Samarkand. Competitive ability was measured by φ, reflecting the

proportion of wild-type as opposed to 6CL flies emerging from competitive cultures, the proportion being transformed to φ by the angular transformation. The eight true-breeding lines were

used as parents in a set of diallel crosses made in triplicate. The variance of the means of female arrays was greater than that of male arrays, suggesting some form of maternal effect. The

general consequences of maternal effects in diallel experiments are described, and the analysis of diallels in which the genetical constitution of the parents is defined, is developed.

Analysis of the results from the diallel experiment gives evidence of additive and dominance effects of the genes affecting competitive ability. These effects are constant over the three

replicates and there is some indication of duplicate-type interaction among the genes. The analysis is also strongly suggestive of a maternal effect, associated chiefly with the distribution

of the X chromosome and variable over the replicates. The results of a non-diallel type of experiment are less informative but in general agreement. An apparent maternal effect of the kind

found, when associated with the X chromosome, could in principle arise from the direct action of sex-linked genes, but reasons are advanced for not favouring this interpretation. Rather, the

maternal effect is attributed to differences among the properties of females from the eight lines, probably in their behaviour in respect of egg-laying. SIMILAR CONTENT BEING VIEWED BY

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Competition in _Drosophila._ II. Homozygous lines. _Heredity_ (in the press). Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Unilever Ltd., Sharnbrook, Bedfordshire Anne

McGill * Department of Genetics, University of Birmingham, Birmingham, B15 2TT Kenneth Mather & P D S Caligari Authors * Anne McGill View author publications You can also search for this

author inPubMed Google Scholar * Kenneth Mather View author publications You can also search for this author inPubMed Google Scholar * P D S Caligari View author publications You can also

search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE McGill, A., Mather, K. & Caligari, P. Competition in

_Drosophila_ III. A possible maternal effect. _Heredity_ 30, 211–225 (1973). https://doi.org/10.1038/hdy.1973.23 Download citation * Received: 01 May 1972 * Issue Date: 01 April 1973 * DOI:

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