Final answer:
Incomplete dominance is a genetic situation where the heterozygote's phenotype is intermediate between those of the two homozygotes, neither allele being dominant or recessive. It results in phenotypes that are a blend of the parental traits, such as pink flowers from red and white snapdragons.
Step-by-step explanation:
Incomplete Dominance
Incomplete dominance describes a genetic scenario where the heterozygote exhibits a phenotype that is intermediate between the phenotypes of both homozygotes. Contrary to complete dominance where one allele completely masks the other, incomplete dominance results in an expression of a phenotype that is a blend of the parental traits. For instance, when a snapdragon plant with red flowers is crossed with one possessing white flowers, the resulting offspring exhibit pink flowers, demonstrating incomplete dominance. Traits in incomplete dominance are neither dominant nor recessive. This means that both alleles contribute to the intermediate phenotype observed in the offspring.
In the context of the presented statements: 'Traits are usually dominant.' does not accurately describe incomplete dominance. 'Traits are neither dominant nor recessive.' and 'Offspring exhibit an intermediate form of alleles from the parents.' are accurate statements concerning incomplete dominance. The statement 'Both alleles, one from each parent, are expressed in offspring.' is indicative of codominance rather than incomplete dominance, though it is true that both alleles interact in the heterozygote to produce the intermediate phenotype.