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the number of phenotypic classes increases.

Phenotype classes the number of phenotypic classes increases.

Phenotype classes

22.5 The results of crossing individuals heterozygous for different numbers of loci affecting a characteristic.

modified the phenotypes, distinguishing between the five phenotypic classes would have been difficult. Finally, the loci that Nilsson-Ehle studied were not linked; so the genes assorted independently. Nilsson-Ehle was fortunate—for many polygenic characteristics, these simplifying conditions are not present and Mendelian inheritance of these characteristics is not obvious.

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