Multiple Allele
An allele is the alternative form of a
gene. When more than two forms of a gene exist on a single chromosome locus, the alleles are called multiple alleles.
Production of multiple alleles
Multiple alleles are produced by gene mutation. A slight change in the nucleotide sequence of a gene results in the
formation of alleles.
Number of multiple alleles
The number of
alleles controlling a character varies. The ABO blood group system is
controlled by three alleles of gene I. Some genes may have as many as 300 alleles for a character. Multiple alleles exist in the individual of a
population but individuals
have only two of those alleles. This is because
most organisms are diploid with two homologs of each chromosome.
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