Mendel researched round versus wrinkled seeds in pea plants and seed color (yellow versus green). Just to refresh your memory, the round allele (R) is dominant to the wrinkled allele (r), and the yellow allele (Y) is dominant to the green allele (y).
Thus, the genotype of a heterozygous yellow-seeded plant will be "Yy," whereas a green-seeded plant will have the genotype "yy" (as the recessive allele is expressed only in homozygous conditions).
As a result, genotype YYRR stands for the pure-breeding round yellow parent, while genotype YYRR stands for the pure-breeding green wrinkled parent. Character-specific gene pairs assort independently of one another during gamete development.
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