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How to understand nonallelic genes, please give examples, and it is best to have pictures.

Alleles refer to genes that control relative traits at the same position on chromosomes. For example, in Drosophila traits, C and cc are a pair of alleles, which control the color of eyes cc red CC white, and D and D are a pair of alleles, which control the shape of wings. C/c and D/d are non-allelic. ? This picture is the chromosome of Drosophila.