Principle of Multiple Allele The genes of a particular trait are located in specific loci in the chromosomes. Multiple Alleles cont. An allele is a specific form of a gene. 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. Alleles are responsible for the variations in which a given trait can be expressed. ABO blood groups - 3 different alleles (IA, IB, i) - 4 phenotypes (A, B, AB,O) - 6 Genotypes: Type A- IAIA or IAi Answer and Explanation: ... View this answer A multiple allele trait is when there are more than two alleles that are present in a population. Generally, anything determined by more than two different alleles is considered a multiple allele trait. ... To view an explanation of the problem, select the "TUTORIAL" button. Examples An allele is specific variation of a gene. Multiple Alleles Confer Drug Resistance in the Malaria Parasite. 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). The Punnett square can be used to predict the genotype frequencies resulting from multiple allele crosses. Morgan in 1910 described the first case of multiple alleles of a gene controlling eye colour in Drosophila during his studies on mutation. Alleles occur in pairs. 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. Function: Genes are responsible for the expression of traits. Multiple Alleles in Population Definition Alleles represent one or more sets of gene copies acquired by an individual from both of the parents. 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. Blood Types in humans. 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. 2. Pairing: Genes do not occur in pairs. Allele Definition. T.H. 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. 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. Allele: Definition: A gene is a portion of DNA that determines a certain trait. Example. What Is a Multi-Allele Trait?. 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