Example. ABO blood groups - 3 different alleles (IA, IB, i) - 4 phenotypes (A, B, AB,O) - 6 Genotypes: Type A- IAIA or IAi 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 … Definition of multiple alleles in the Definitions.net dictionary. Multiple Alleles . A common example of this in humans is ABO blood type. 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. - Each Individual can only have 2 alleles for each trait; one from each parent. Medical definition of multiple allelism: the state of having more than two alternative contrasting characters controlled by multiple alleles at a single genetic locus. Importance of Allelism. Meaning of Multiple Alleles 2. Alleles may occur in pairs, or there may be multiple alleles affecting the expression of a particular trait. Look it up now! Multiple Alleles - When three or more alleles control a trait. A multiple allele trait is when there are more than two alleles that are present in a population. While most genes exist in two allele forms, some have multiple alleles for a trait. Blood Types in humans. If the paired alleles are the same, the organism’s genotype is said to be homozygous for that trait; if … Examples 4. Characteristics of Multiple Alleles 3. The combination of alleles that an organism carries constitutes its genotype . 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. Characteristics of multiple alleles: 1. Multiple alleles definition: three or more alternative forms of a particular gene existing in a population | Meaning, pronunciation, translations and examples In this case, there are three alleles circulating in the population. Multiple alleles are always at the same location (locus) in the chromosome. Multiple Alleles cont. albino series of coat colors in rabbits, eye color in Drosophila and blood groups in man etc. 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 … 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. An example of multiple alleles is the ABO blood-type system in humans. Information and translations of multiple alleles in the most comprehensive dictionary definitions resource on the web. 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