One or two or more alternative form of a gene, for example, all genes controlling a flower color of plant ina similar or dissimilar manners are called alleles.
When an individual possesses two alleles controlling a common character in a similar manner. For examples, TT (Gene for Tallness), RR (Gene for red color)
The allele which masks the appearance of another allele in heterozygous condition is said to be dominant.
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