Multiple Alleles
So far, it has been observed that a given phenotypic trait of an individual depends on a single pair of genes, each of which occupies a specific position called the gene locus, on a homologous chromosome. Moreover, a particular gene has been found to occur in two alternative forms. For example, a gene (L) for length of Drosophila wings may occur in two alternative forms: a gene (L+) for normal development of wings and a gene (Lvg) for vestigial wings. Because, most flies have normally developed wings, so, it can easily De concluded that gene L + is the original form of gene from which the other form of gene (Lvg) might have originated by certain mutational event at sometime in past. The gene L+ for normal development of wings is called the normal or wild type allele of the gene L and usually symbolized as L+, while the mutated gene Lvg for vestigial wings is called Lvg reduced type or mutant allele of gene L.
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