Final answer:
Incomplete penetrance is the correct term that reflects the genotype of an individual in the phenotype, which is not always observed due to the genotype not fully penetrating to produce an expected phenotype.
Step-by-step explanation:
The correct answer that reflects the genotype of an individual in the phenotype is B) incomplete penetrance. Incomplete penetrance occurs when an individual has a certain genotype that does not always show in the phenotype. This is different from complete dominance, where the phenotype only reflects the dominant allele, excluding the recessive allele from having any observable effect on the phenotype. On the contrary, incomplete dominance is a pattern in which the heterozygote expresses a phenotype that is intermediate between the phenotypes of both homozygotes, and in this instances, one can diagnose an organism's genotype directly from its phenotype. In the context of alleles, codominance and multiple alleles contribute to the phenotype in a manner where both alleles can be observed in the phenotype, such as in the ABO blood group system, which exhibits both codominance and multiple alleles, demonstrating that alleles do not always conform to strict dominant and recessive patterns.