Meaning of multiple alleles. Characteristics of multiple alleles: 1. For example, the ABO BLOOD GROUP gene has at least six alleles. Multiple alleles definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. In practice it seems likely that all genes must possess many alternative alleles but these often remain undetected since no noticeable alteration of PHENOTYPE is observed. Alleles may occur in pairs, or there may be multiple alleles affecting the expression of a particular trait. Definition of multiple alleles in the Definitions.net dictionary. Example. A common example of this in humans is ABO blood type. Human blood type is determined by the presence or absence of certain identifiers, called antigens, on the surface of red blood cells.Individuals with blood type A have A antigens on blood cell surfaces, those with type B have B … Multiple alleles are always at the same location (locus) in the chromosome. Multiple Alleles - When three or more alleles control a trait. Characteristics of Multiple Alleles 3. albino series of coat colors in rabbits, eye color in Drosophila and blood groups in man etc. The I A allele codes for A molecules on the red blood cells, the I B allele codes for B molecules on the surface of red blood cells, and the i allele codes for no molecules on the red blood cells. A multiple allele trait is when there are more than two alleles that are present in a population. Meaning of Multiple Alleles: The word allele is a general term to denote the alternative forms of a gene or contrasting gene pair that denote … Theories of Allelism 5. In this case, there are three alleles circulating in the population. - Each Individual can only have 2 alleles for each trait; one from each parent. Blood Types in humans. Meaning of Multiple Alleles 2. An example of multiple alleles is the ABO blood-type system in humans. Importance of Allelism. What does multiple alleles mean? If the paired alleles are the same, the organism’s genotype is said to be homozygous for that trait; if … Multiple alleles is a series of three or more alternative forms of same gene occupying a single locus on the chromosome, e.g. Multiple alleles definition: three or more alternative forms of a particular gene existing in a population | Meaning, pronunciation, translations and examples ABO blood groups - 3 different alleles (IA, IB, i) - 4 phenotypes (A, B, AB,O) - 6 Genotypes: Type A- IAIA or IAi While most genes exist in two allele forms, some have multiple alleles for a trait. Multiple Alleles cont. Look it up now! The combination of alleles that an organism carries constitutes its genotype . Multiple Alleles . multiple allelism the occurrence of more than two ALLELES of a gene, although only two may be present together in an individual at any one time. 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