A dominant trait is one which expresses or masks the other trait. In a genome, there are two opposing alleles of a gene, namely dominant and recessive. A dominant trait always expresses itself over a recessive trait, even if only one copy is present.
For example, in a heterozygous condition such as Tt, where T is tall and t is dwarf, T will express over t and the phenotype of the organism will be tall.
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