Some of these problems describe the functioning of two genes. Students summarize how the genes interact in words; indicate the phenotypes of the true-breeding genotypes; indicates the offspring genotypes and phenotypes that result from crossing two true-breeding strains and intercrossing the offspring; and finally the student describes in words how the genes interact to determine each phenoytpe.
In other problems, students are given the results of crossing true-breeding strains and intercrossing the offspring. Students summarize how the genes appear to interact in words; indicate the phenotypes of the true-breeding genotypes; and finally the student explains the F2 phenotypes, phenotype ratios, and genotypes in the given cross and describe how the genes interact to determine each phenotype. |