PATHOLOGY

Detailed explanation-1: -So the dominant allele is always expressed, but it can differ in penetrance and is therefore not always as clearly expressed in the cell’s phenotype as you expect from a dominant allele.

Detailed explanation-2: -Dominant phenotypes are always expressed if a dominant allele is present in the genotype. Thus, if the genotype is “AA” or “Aa", the dominant phenotype is expressed.

Detailed explanation-3: -A dominant allele produces a dominant phenotype in individuals who have one copy of the allele, which can come from just one parent. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent.