Test Crosses

How can you find the genotype of a dominant phenotupe? If you have a guinea pig with a dominant phenotype, what’s the possible genotype(s) for that trait? homozygous dominant or heterozygous If the guinea pig has a recessive phenotype, what’s the possible genotype(s) for that trait? homozygous recessive How can you use what you know about dominant/recessive to find the ACTUAL genotype of that dominant phenotype? Do a test cross! crossing a dominant phenotype with a recessive phenotype will determine the dominant genotype

Test Cross Guinea pig with folded ears (dominant phenotype) – is the guinea pig EE or Ee? If you cross it with a straight-eared guinea pig (ee), you will see! Example…