You perform a test cross of the dihybrid aabb with a double homozygous aabb, and you score the phenotypes of 1000 progeny. if genes a and b are completely genetically linked (i. e., no recombination between loci), what offspring counts do you expect to observe? all 1000 with the ab phenotype. all 1000 with the ab phenotype.250 with the ab phenotype, 250 with the ab phenotype, 250 with the ab phenotype, and 250 with the ab phenotype. all 1000 with the ab phenotype500 with the ab phenotype, and 500 with the ab phenotype.