Inbreeding exposes recessive alleles through increasing homozygosity. An individual can have two copies of the same allele or two different alleles. I alleles and gene expression or protein translation levels. Biodiversity can be defined genetically as the diversity of alleles, genes and organisms. In cases of codominance the phenotypes produced by both alleles are clearly expressed. Inbreeding is likely avoided because it leads to the expression of recessive deleterious alleles. Inbreeding is avoided because it ordinarily leads to the expression of recessive deleterious alleles. Populations with many similar alleles have small genetic distances. This is associated with the unmasking and elimination of severely deleterious recessive alleles. In nature, genes often exist in several different forms with multiple alleles. Zygosity may also refer to the origin(s) of the alleles in a genotype. The study found that 46% were pure dingoes which exhibited no dog alleles (gene expressions). It is completely dominant to all other alleles at this locus. Consider a locus that carries two alleles, A and B. Consider a gene with two alleles, A or B.