:" Suppose that Aa is a pair of Mendelian characters, A being dominant, and that in any given generation the number of pure dominants ( AA ), heterozygotes ( Aa ), and pure recessives ( aa ) are as " " p " : 2 " q " : " r " . " Finally, suppose that the numbers are fairly large, so that mating may be regarded as random, that the sexes are evenly distributed among the three varieties, and that all are equally fertile.
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