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•It is when more than two alleles can code for a gene
•Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist in a population level, and different individuals in the population may have different pairs of these alleles.
• Gene mutations may produce many different alleles of a gene
• All such altered alterriative forms of a gene, whose number is more than two, are called multiple alleles.
• Any two of these multiple alleles can be present in the genome of a diploid organism, but a haploid organism or a gamete can have just one of them in its genome.
•In human population, one of examples of multiple allelism is inheritance of ABO blood types involving three alleles (I, IA, Ib).

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When a gene or gene pair masks or prevents the expression of other non-allelic gene, called epistasis. The gene which produces the effect called epistatic gene and the gene whose expres sion is suppressed called hypostatic gene.

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are alleles that cause the death of the organism that carries them. They are usually a result of mutations in genes that are essential for growth or development.