102 Lecture Notes - Allele, Red Blood Cell, Eye Color
Document Summary
More than two alternative allelic forms of gene occupy the same loci in a pair of homologous chromosomes in the population are called multiple alleles. Determination of a trait by more than two alleles is called multiple allelism. All the variants or alleles of a gene may be originated by mutation of a single wild type gene. It can only be studied in populations. Multiple alleles occupy the same locus with in the homologous chromosomes. It means only one member of the series is present in a given chromosome. Since only two chromosomes of each type are present in each diploid cell, only two genes of the multiple series are found in a cell and also in a given individual. The gametes contain only one chromosome of each type, therefore, only one allele of the multiple series in each gamete. Crossing over does not occur in the multiple alleles.
