and the e allele for brown eye color. The red (E) phenotype is dominant to the brown (e) phenotype, so heterozygous flies with the genotype Ee will have red eyes. When two flies that are ...

See how researchers use test crosses to find out the genotype behind the phenotype. The test cross ... yellow-body allele (E), while the brown-eye allele (b) is recessive to the normal red-eye ...