What is a dominant allele?
A. An allele that has no noticeable affect on an organism's phenotype
B. In a heterozygous individual, the allele that determines the phenotype
C. An allele that is very prevalent in a population
D. An allele that will only have an affect on phenotype in a haploid organism; otherwise its presence will be masked
E. An allele that totally beats up on a recessive allele
Answer: B
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