When one allele expresses itself and the other does not

When one allele expresses itself and the other does not -...

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When one allele expresses itself and the other does not, the one  expressing itself is the  dominant  allele.  The overshadowed allele is the  recessive  allele.  In humans, the allele for free earlobes is the dominant allele.  If this allele is present with the allele for attached earlobes, the allele  for free earlobes expresses itself, and the phenotype of the individual 
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Unformatted text preview: is free earlobes. Dominant alleles always express themselves, while recessive alleles express themselves only when two recessive alleles exist together in an individual. Thus, a person having free earlobes can have one dominant allele or two dominant alleles, while a person having attached earlobes must have two recessive alleles....
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