Question

In Mendel's pea plants, there is a gene that controls pea shape (round is dominant to wrinkled), and a second gene that controls pea color (yellow is dominant to green). What is the phenotypic ratio of the offspring plants from a dihybrid cross between two round yellow pea plants? Step 1: Identify the genes and choose a letter to represent EACH gene (2 different letters). Step 2: Define the alleles for each gene. There should be two types of letters with capital and lowercase for each. Step 3: Write down the genotypes for the cross. Don't forget each plant must be diploid (have 2 alleles) for each gene – so 4 letters total! Step 4: Draw the Punnett square. Write one gamete allele combination over each column or row. *Remember the FOIL method to identify the gamete allele combinations… Step 5: Use the filled-in Punnett square to answer the question.

          In Mendel's pea plants, there is a gene that controls pea shape (round is dominant to wrinkled), and a second gene that controls pea color (yellow is dominant to green). What is the phenotypic ratio of the offspring plants from a dihybrid cross between two round yellow pea plants?
Step 1: Identify the genes and choose a letter to represent EACH gene (2 different letters).
Step 2: Define the alleles for each gene. There should be two types of letters with capital and lowercase for each.
Step 3: Write down the genotypes for the cross. Don't forget each plant must be diploid (have 2 alleles) for each gene – so 4 letters total!
Step 4: Draw the Punnett square. Write one gamete allele combination over each column or row. *Remember the FOIL method to identify the gamete allele combinations…
Step 5: Use the filled-in Punnett square to answer the question.

Added by Lisa B.

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