A complete diallel cross of 10 selected wheat varieties was grown for three years (1957-1959) at Davis, California, to determine whether genetic information useful in the breeding of self-pollinated plants could be obtained from parental and F1 data. The character studied was heading date. Analysis of the data indicated that a few major genes with dominance effects were the most important feature of the genetic system. A system of minor genes displaying little or no dominance was also discovered. There was no evidence for any important epistatic effects. The various genotypes were found to behave fairly similarly over the three-year period. Variances and frequency distributions observed in 7 F2 test populations and certain other segregating generations grown in 1958 corresponded closely in most cases to those predicted on the basis of the 1957 diallel cross analysis. Microfilm Supplement Material deleted from the original manuscript is available on positive film strips for use in a microfilm reader. The strips are on deposit in the Agricultural Reference Service, University of California Library, Berkeley, and in the Library of the U. S. Department of Agriculture, in Washington, D.C. These are identified in the card catalog as follows: Crumpacker, David W., and R. W. Allard, A Diallel Cross Analysis of Heading Date in Wheat, Hilgardia, Volume 32, Number 6, April, 1962. Copies of the entire microfilm supplement may be purchased from Library Photographic Service, University of California, Berkeley. The price for a positive microfilm copy is $3.00 plus postage. Specify L.P.S. Misc. Microfilm No. 52. Copies of the entire supplement enlarged to 8½? × 11? are available for $7.00 each plus postage from the Library Photographic Service. Copies of individual pages are available for 25 cents per print (2 pages per print). Minimum order $3.00 plus postage. Specify L.P.S. Misc. Microfilm No. 52 and give the page numbers desired. Do not pay in advance. Pay on receipt of invoice.
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