Are dominant alleles always expressed in the phenotype?

Answer 1

Yes, but the penetrance of the allele can differ.

When an allele is incompletely dominant, a cell with one dominant allele and one recessive allele (heterozygous) can exhibit intermediate phenotypes, which are referred to as co-dominance when two different alleles contribute equally to the phenotype. Nevertheless, incompletely dominant alleles will always be expressed in the phenotype of the cell.

Thus, although the dominant allele is always expressed, its penetrance varies, and as a result, its expression in the cell's phenotype is not always as obvious as one would expect for a dominant allele.

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Answer 2

Emma Arvizu

Yes, dominant alleles are typically expressed in the phenotype when present.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.