If every sexually reproducing organism has only two alleles for each gene,how can there be a range of traits seen for a physical characteristic?

Question

Quizplus · Accepted Answer

While an individual organism may only have two alleles for a gene, there can be multiple variations of that gene (alleles) present in a population. For example, the gene that determines human blood type has three different alleles (A, B, and O), resulting in four different blood types (A, B, AB, and O). Therefore, the range of physical characteristics seen within a population can be attributed to the presence of multiple alleles for a given gene.

If Every Sexually Reproducing Organism Has Only Two Alleles for Each