is heterozygous genotype or phenotype
Heterozygous refers to the genotype, not the phenotype.
Genotype refers to the combination of alleles (gene variants) an organism possesses for a particular trait. In the case of heterozygosity, an organism has two different alleles for a specific gene.
Phenotype, on the other hand, refers to the observable characteristics or traits of an organism resulting from the interaction of its genotype and the environment. While heterozygosity can influence the phenotype, it is the phenotype that is physically expressed or exhibited.