What term describes a distinguishing feature of personal nature in genetics?

The term that describes a distinguishing feature of personal nature in genetics is "trait." A trait is a characteristic that can be observed in an individual, such as eye color, height, or blood type, and it results from the interaction between an organism’s genetic makeup (genotype) and its environment. Traits are specific qualities that define individuals and can be influenced by one or multiple genes.

While "phenotype" refers to the observable physical and behavioral characteristics resulting from the genotype, "trait" is more specific to an individualistic feature. "Allele" refers to the different forms of a gene that can exist, and "homozygous" relates to having identical alleles for a particular gene. Therefore, "trait" is the most accurate term for describing personal characteristics in genetics.