A gene is said to be dominant if:
It expresses its effect only in the homozygous stage
It expresses only in heterozygous condition
It expresses both in homozygous and heterozygous conditions
It is never expressed in any condition
, a dominant allele (factor) expresses its character (phenotype) in both homozygous (e.g., TT) and heterozygous (e.g., Tt) conditions. In contrast, a recessive character is expressed only in the homozygous condition (e.g., tt) .
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