Florida Biology EOC Practice Test

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What is 'incomplete dominance'?

  1. Alleles for the genes are neither dominant nor recessive

  2. Traits from both alleles are expressed in phenotype of offspring

  3. Having identical alleles for a trait

  4. More than two alleles for one gene

The correct answer is: Alleles for the genes are neither dominant nor recessive

Incomplete dominance is a genetic scenario where neither allele is completely dominant over the other, leading to a blend of traits in the offspring's phenotype. This condition allows for the expression of an intermediate phenotype that is distinct from both parental traits. In this situation, if one parent has a red flower and the other has a white flower, the offspring may have pink flowers, which is a mix of the two colors. Hence, the correct understanding of incomplete dominance is that alleles for the genes are neither fully dominant nor recessive, resulting in a blending effect. Other options relate to different genetic concepts. For example, the expression of traits from both alleles pertains more to codominance, where both traits are fully expressed, rather than blended. Similarly, having identical alleles refers to homozygosity, and more than two alleles for one gene deals with multiple alleles, which are not relevant to the concept of incomplete dominance.

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