Which term describes both traits being different?

The term that describes both traits being different is "heterozygous." In genetics, an organism is considered heterozygous when it has two different alleles for a particular trait. For example, if one allele represents a dominant trait (like brown eyes) and the other represents a recessive trait (like blue eyes), the individual with one of each allele is heterozygous for that gene.

On the other hand, "homozygous" refers to having two identical alleles for a trait, whether they are both dominant or both recessive. "Dominant" and "recessive" describe the behavior of alleles rather than the combination of alleles present in an organism. A dominant allele can mask the presence of a recessive allele, but by itself, it does not imply anything about whether the alleles are the same or different. Heterozygous specifically captures the essence of having two different traits, making it the correct term for this question.