4. When a trait is coded by a series of genes all on different chromosomes, this is called what?
Multiple genes not alleles. Height in humans is coded by a series of five sets of genes, all on different chromosomes. Since they are not located on the same chromosome pair at the same locus, they cannot be alleles. In this case each gene pair contributes to the phenotype of the individual, AABBCCDDEE would be very tall and aabbccddee would be very short.
