ion. These are the result of a monohybrid cross (two heterozygous parents) and we expect
a ratio of 3 dominant phenotypes to 1 recessive phenotype.
II. Test Cross: Count the yellow and purple kernels for 3 ears of corn from the “1:1” collection.
These are the result of a test cross (two heterozygous parents) and we expect a ratio of 1
dominant phenotype to 1 recessive phenotype.
III. Dihybrid Cross: Count the kernels for 3 ears of corn from the “9:3:3:1” collection. These are
the result of a dihybrid cross (two heterozygous parents for two traits) and we expect a ratio of 9
dominant/dominant: 3 dominant/recessive: 3 recessive/dominant: 1 recessive/recessive.