Test Crosses - PowerPoint PPT Presentation

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  1. Test Crosses

  2. 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

  3. 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…