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or by constructing an 8 x 8 Punnett square (the gametes are ABC, AbC, ABc, Abc, aBC, abC, aBc, and abc). The phenotypes are in an expected ratio of 1 : 6 : 15 : 20 : 15 : 6 : 1 for phenotypes of 1,

2 4 2 4 27, 37, 5, 67, 77, and 9 as shown in Fig. 9.19. 6 6 6 6

Genotypes

Figure 9.19 The genotypes and distribution of phenotypic values for a trait caused by three codominant diallelic loci in a randomly mating population where all alleles at each locus have a frequency of V2.

AA Bb cc AA bB cc AA bb Cc AA bb cC Aa Bb Cc Aa Bb cc Aa bB Cc aA Bb cc Aa Bb cC Aa bB cc Aa bB cC aA bB cc Aa BB cc Aa bb Cc Aa bb CC Aa bb cC aA Bb Cc aA bb Cc aA bB Cc aA bb cC aA Bb cC aa Bb Cc aA bB cC aa Bb cc aa Bb cC aA BB cc aa bB cc aa bB Cc aA bb CC Aa bb cc aa bB cC aa BB Cc aA bb cc AA bb cc aa BB cC aa bb Cc aa BB cc aa Bb CC aa bb cc aa bb cC aa bb CC aa bB CC

AA Bb Cc AA Bb cC AA bB Cc AA bB cC Aa Bb CC aA Bb CC Aa bB CC aA bB CC Aa BB Cc

Aa BB cC AA Bb CC aA BB Cc AA bB CC aA BB cC AA BB Cc AA BB cc AA BB cC AA bb CC Aa BB CC aa BB CC aA BB CC AA BB CC

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