Morgan in 1910 described the first case of multiple alleles of a gene controlling eye colour in Drosophila during his studies on mutation. Allele Definition. Example. Blood Types in humans. Multiple allele - Genetics 1. Alleles are responsible for the variations in which a given trait can be expressed. T.H. An allele is specific variation of a gene. 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. Pairing: Genes do not occur in pairs. ... To view an explanation of the problem, select the "TUTORIAL" button. 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. - Each Individual can only have 2 alleles for each trait; one from each parent. 2. 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. 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. Principle of Multiple Allele The genes of a particular trait are located in specific loci in the chromosomes. ABO blood groups - 3 different alleles (IA, IB, i) - 4 phenotypes (A, B, AB,O) - 6 Genotypes: Type A- IAIA or IAi What Is a Multi-Allele Trait?. 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. Multiple Alleles cont. Multiple Alleles Confer Drug Resistance in the Malaria Parasite. An allele is a specific form of a gene. Function: Genes are responsible for the expression of traits. 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. The Punnett square can be used to predict the genotype frequencies resulting from multiple allele crosses. Allele: Definition: A gene is a portion of DNA that determines a certain 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. Examples Alleles occur in pairs. Examples of Multiple Alleles. 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