By R. W. Allard, A. L. Kahler, M. T. Clegg (auth.), Freddy B. Christiansen, Tom M. Fenchel (eds.)
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The probability of correct identification is a function of gene frequency and the outcrossing rate. 99). The system is a practical one because the cost and labor of assaying the numbers of progeny indicated above are not great. The data from the progeny arrays allow us to make direct estimates of the genetic composition of the array of genotypes among reproducing adults in generation n, gene frequencies (p and q) in the pollen pool, and also the mating system parameters sand t. The data from the bulk seed harvests allow direct estimates of the genetic composition of the array of new zygotes in generation nand n+1 shortly after the reproductive cycle.
Goodness of Fit" of Lotium muZtifZorum adults to Hardy- Weinberg expectations (Peroxidase). 1900 Genotype 11 12 22 34 2 EXpected 64 2 p 2pq q Expected No. 50 2 4 Selection in plants TabZe 2. "Goodness of Fit" of LoZium muZtifZorum seedlings to HardyWeinberg expectations (Peroxidase). 1821 Genotype 11 12 22 Observed 675 240 57 Expected P 2pq q Expected No. 001 essary to separate the life cycle, particularly the reproductive cycle, into as many stages as possible. This procedure has been advocated repeatedly by Prout on theoretical grounds (Prout, 1971a and earlier) and Prout (197lb) has shown in laboratory experiments with Drosophila that very strong selection does in fact occur during one or more stages in the reproductive cycle.
This same population was also sampled in the seedling stage in the next generation. The results, given in Table 2, show that the fit to Hardy-Weinberg expectations is now extremely poor due to a deficiency of heterozygotes and a sUbstantial excess of both homozygotes. e. for the seedling array to be deficient in heterozygotes and for the proportion of heterozygotes to increase sharply from seedling to adult stages, until in many cases there is even an excess of heterozygotes over Hardy-Weinberg expectations at maturity.
Measuring Selection in Natural Populations by R. W. Allard, A. L. Kahler, M. T. Clegg (auth.), Freddy B. Christiansen, Tom M. Fenchel (eds.)