List any three characteristic features of multiple allele.

Explanation

`**` Multiple alleles of a series always occupy the same locus in the homologous chromosome.
`**` Therefore, no crossing over occurs within the alleles of a series.
`**` Multiple alleles are always responsible for the same character.
`**` The wild type alleles of a series exhibit dominant character whereas mutant type will influence dominance of an intermediate phenotypic effect.