In incomplete dominance, what is the phenotypic outcome for heterozygotes?

In incomplete dominance, what is the phenotypic outcome for heterozygotes?

• A. They exhibit only one of the dominant alleles
• B. They show an intermediate phenotype
• C. They express both dominant traits equally
• D. They show no phenotype

Answer: (B)

In cases of incomplete dominance, the phenotype of heterozygotes is characterized by a blending of traits from both alleles. This means that when an individual inherits two different alleles for a trait, neither allele is completely dominant over the other. As a result, the phenotype expressed is an intermediate form between the two parental traits. For example, if one parent has red flowers (dominant) and the other has white flowers (also considered a different allele), the offspring that are heterozygous might exhibit pink flowers, which is a mix of the two colors. This intermediate phenotype clearly illustrates how incomplete dominance works, as it does not show the traits distinctly but rather combines them into a new expression. The other options do not accurately reflect the nature of incomplete dominance, where a mix is evident rather than a full expression of one dominant trait, equal expression of both, or the absence of a phenotype altogether.

In cases of incomplete dominance, the phenotype of heterozygotes is characterized by a blending of traits from both alleles. This means that when an individual inherits two different alleles for a trait, neither allele is completely dominant over the other. As a result, the phenotype expressed is an intermediate form between the two parental traits.

For example, if one parent has red flowers (dominant) and the other has white flowers (also considered a different allele), the offspring that are heterozygous might exhibit pink flowers, which is a mix of the two colors. This intermediate phenotype clearly illustrates how incomplete dominance works, as it does not show the traits distinctly but rather combines them into a new expression.

The other options do not accurately reflect the nature of incomplete dominance, where a mix is evident rather than a full expression of one dominant trait, equal expression of both, or the absence of a phenotype altogether.