Adominant allele is best defined as a dominant allele is best defined as the healthy allele sometimes referred to as the wild type allele an allele that stops or hides the expression of another allele the allele that is most frequently expressed in a given population the stronger of two matched alleles

The correct answer to the definition of a dominant allele is the allele that stops or hides the expression of another allele in an organism (B).

Explanation:

The expression seen, usually called phenotype is controlled by genetic compositions enclosed within the chromosomes in the nucleus, if eukaryotes, or nucleoid, if prokaryotes. The chromosome is a pair of two alleles, which are responsible for the trait, with the two possibilities that can be seen. The allele which has the potential of silencing the other allele is called the dominant allele, they are usually represented in capital letters, they will dictate the phenotype of the organism even in the presence of the other allele. This other allele is called recessive allele, which are only expressed when they are homozygous. Dominant allele expresses themselves both in heterozygous and homozygous genotype.