Considering the Mendelian traits round versus wrinkled and yellow versus green, consider...

Considering the Mendelian traits round versus wrinkled and yellow versus green, consider the crosses below and determine the genotypes of the parental plants by analyzing the phenotypes of their offspring.

HINT: This problem involves an understanding of Mendelian postulates, including independent assortment. The key to its solution is in each case, to determine everything that you know for certain. This reduces the problem to its bare essentials and clarifies what remains to be figured out. For example, the wrinkled, yellow plant in case (b) must be homorygous for the recessive wrinkled alleles and bear at least one dominant allele for the yellow trait. Having established this, you need only determine the remaining allele for cotyledon color.