Through the help of the modern technology, geneticists discovered that there are some traits that are not controlled only by two alleles but by multiple alleles. What Is a Multi-Allele Trait?. Allele Definition. T.H. Alleles are responsible for the variations in which a given trait can be expressed. Multiple Alleles cont. Allele: Definition: A gene is a portion of DNA that determines a certain trait. Examples of Multiple Alleles. Alleles occur in pairs. Such a system in which one gene has more than two allelic states at the same locus in different members of the population is known as a multiple allele system. Generally, anything determined by more than two different alleles is considered a multiple allele trait. Answer and Explanation: ... View this answer A multiple allele trait is when there are more than two alleles that are present in a population. Function: Genes are responsible for the expression of traits. However, one cannot be certain of an individual's genotype if they are blood type A or B because there are two possible genotypes for each of these blood types. Multiple Alleles - When three or more alleles control a trait. Morgan in 1910 described the first case of multiple alleles of a gene controlling eye colour in Drosophila during his studies on mutation. The ABO system in humans is controlled by three alleles, usually referred to as I A, I B, and I O (the "I" stands for isohaemagglutinin). Bacteria, because they have a single ring of DNA, have one allele per gene per organism.In sexually reproducing organisms, each parent gives an allele for each gene, giving the offspring two alleles per gene. - Each Individual can only have 2 alleles for each trait; one from each parent. 2. The earliest understanding of genetics was based on traits coded for by a single gene with two alleles, or variations of the gene, where one allele for the trait was dominant and prevented the other, recessive, allele from being expressed. The Punnett square can be used to predict the genotype frequencies resulting from multiple allele crosses. An allele is a specific form of a gene. Multiple Alleles Confer Drug Resistance in the Malaria Parasite. Two human examples of multiple-allele genes are the gene of the ABO blood group system, and the human-leukocyte-associated antigen (HLA) genes. When multiple Rps alleles are present in the same line, it is difficult to use these methods to assay for each individual allele because the resistant phenotype is the same when a line possesses one allele or multiple alleles. Principle of Multiple Allele The genes of a particular trait are located in specific loci in the chromosomes. Example. An allele is specific variation of a gene. 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