. The elements of genetics. Genetics. CUMULATIVE EFFECTS OF GENES GENOTYPES. DISTRIBUTION OF PHENOTYPES Fig. 15.—Diagram showing the relations between the genotypes and the frequency distribution of phenotypes where two genes of equal and additive effect are varying independently of one another and two allelomorphs of each gene are equally common. Dominance is assmned to be absent, so that the phenotypic expression is proportional to the number of capital letters in the genotype. Five phenotypic classes will be produced with two genes of equal effect, seven phenotypic classes with three genes,
. The elements of genetics. Genetics. CUMULATIVE EFFECTS OF GENES GENOTYPES. DISTRIBUTION OF PHENOTYPES Fig. 15.—Diagram showing the relations between the genotypes and the frequency distribution of phenotypes where two genes of equal and additive effect are varying independently of one another and two allelomorphs of each gene are equally common. Dominance is assmned to be absent, so that the phenotypic expression is proportional to the number of capital letters in the genotype. Five phenotypic classes will be produced with two genes of equal effect, seven phenotypic classes with three genes, nine with four, and so on. As the number of classes increases, and as non-heritable influences exert their effect, the distribution of phenotypes approximates more closely to a continuous curve. 67. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darlington, C. D. (Cyril Dean), 1903-; Mather, Kenneth. New York : Macmillan
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